Providers Amy Callahan to Dorian Callahan, LPCC
300 individual NPIs in the federal registry, part 3,166 of 24,427 of the A to Z by surname. Each row is the registry's record: the name and credential, the NPI, the primary specialty, the practice city and the year the NPI was issued. 96 link to a page of their own with Medicare and CMS data the registry does not carry.
| Provider | NPI | Specialty | Practice city | NPI issued |
|---|---|---|---|---|
| Amy Callahan | 1245181858 | Clinical Social Worker | Denville, NJ | 2026 |
| Amy Callahan, D.O. | 1437319209 | General Practice Physician | San Diego, CA | 2008 |
| Amy Callahan, OTRL | 1700097110 | Pediatric Occupational Therapist | Joliet, IL | 2007 |
| Amy Callahan | 1720785843 | Community Health Worker | Melrose, MA | 2023 |
| Amy Callahan, CRNP | 1831347640 | Adult Health Nurse Practitioner | Philadelphia, PA | 2008 |
| Amy Callahan, MSSW LCSW | 1851508774 | Clinical Social Worker | Madison, WI | 2007 |
| Amy Callahan | 1972926004 | Licensed Practical Nurse | Phoenix, AZ | 2014 |
| Andie Callahan | 1184071417 | Speech-Language Pathologist | Bayside, NY | 2016 |
| Andrea Callahan, MSHS- COMMUNITY PSYC | 1417223462 | Counselor | Orange, MA | 2012 |
| Andrew Callahan, DC | 1609605203 | Chiropractor | Winthrop, ME | 2024 |
| Andrew Callahan, D.M.D. | 1942639349 | General Practice Dentistry | Fort Carson, CO | 2013 |
| Angela Callahan, LPC, NCC | 1023406204 | Mental Health Counselor | Portsmouth, VA | 2014 |
| Angela Callahan, NP | 1083935753 | Family Nurse Practitioner | Fort Myers, FL | 2010 |
| Angela Callahan | 1205635224 | Mental Health Counselor | Attleboro, MA | 2025 |
| Angelica Callahan | 1821858879 | Social Worker | Toledo, OH | 2024 |
| Angelita Callahan, MD | 1669561650 | Family Medicine Physician | Gainesville, FL | 2006 |
| Anita Callahan, APN | 1902385495 | Family Nurse Practitioner | Dickson, TN | 2018 |
| Ann Callahan, MD | 1093962847 | Surgery Physician | Torrance, CA | 2008 |
| Ann Callahan | 1124703574 | Behavior Technician | Chicago, IL | 2023 |
| Ann Callahan, MD | 1144343328 | Psychiatry Physician | Darien, CT | 2007 |
| Ann Callahan | 1285998211 | Case Manager/Care Coordinator | Norwich, NY | 2012 |
| Ann Callahan, LCSW | 1720044530 | Clinical Social Worker | Knoxville, TN | 2006 |
| Anna Callahan, APRN | 1366020224 | Psychiatric/Mental Health Nurse Practitioner | Dade City, FL | 2021 |
| Anna Callahan, PHARMD | 1720306764 | Pharmacist | Fort Hood, TX | 2010 |
| Anna Callahan | 1790421436 | Student in an Organized Health Care Education/Training Program | Cincinnati, OH | 2022 |
| Anna Callahan, MA, LPC | 1811123094 | Mental Health Counselor | Mount Pleasant, SC | 2009 |
| Anne Callahan, PA-C | 1891082483 | Medical Physician Assistant | San Ramon, CA | 2011 |
| Annette Callahan, LPC | 1043821747 | Mental Health Counselor | Phoenix, AZ | 2020 |
| Annette Callahan, LCSWC | 1104020874 | Clinical Social Worker | Timonium, MD | 2007 |
| Antoinette Callahan | 1164064051 | Assistant Behavior Analyst | Marlborough, MA | 2019 |
| Antonina Callahan, MD | 1699260620 | Family Medicine Physician | Bountiful, UT | 2018 |
| Antwaan Jarome Callahan | 1245059609 | Behavior Technician | Rocklin, CA | 2024 |
| Anzjole Callahan | 1033003181 | Professional Counselor | Washington, DC | 2025 |
| April Callahan, R.D.N | 1235663014 | Registered Dietitian | Wilmington, DE | 2017 |
| April Callahan | 1588350516 | Peer Specialist | Louisa, KY | 2023 |
| April Callahan, MS, RD, CDE | 1841542776 | Registered Dietitian | Phoenix, AZ | 2012 |
| Ariel Callahan | 1427942440 | Behavior Technician | Corona, CA | 2025 |
| Arielle Callahan | 1467119578 | Mental Health Counselor | College Park, MD | 2021 |
| Ashlee Callahan, COTA | 1205319381 | Occupational Therapy Assistant | Sioux Falls, SD | 2018 |
| Ashlee Callahan, DPT | 1558770388 | Physical Therapist | Springfield, MO | 2014 |
| Ashleigh Callahan | 1841176633 | School Psychologist | Syracuse, NE | 2025 |
| Ashleigh Callahan, CCC-A | 1902567621 | Audiologist | Morgantown, WV | 2022 |
| Ashley Callahan, RDH | 1003393307 | Dental Hygienist | Waukesha, WI | 2018 |
| Ashley Callahan, MS | 1285992404 | Speech-Language Assistant | Vero Beach, FL | 2012 |
| Ashley Callahan, DPT | 1417456849 | Physical Therapist | Millville, NJ | 2018 |
| Ashley Callahan | 1437745411 | Behavior Analyst | Howell, NJ | 2020 |
| Ashley Callahan | 1609339852 | Behavior Technician | Anaheim, CA | 2019 |
| Ashley Callahan, LMFTA | 1629408232 | Marriage & Family Therapist | Seattle, WA | 2013 |
| Ashley Callahan, LCSWA | 1871389528 | Clinical Social Worker | Gastonia, NC | 2025 |
| Ashtin Callahan, OTR/L | 1306618772 | Occupational Therapist | Zephyrhills, FL | 2023 |
| Ashton Callahan, PA-C | 1841033883 | Medical Physician Assistant | New Britain, CT | 2024 |
| Audrey Callahan | 1548942782 | Homemaker | Lewis Center, OH | 2023 |
| Audrey Callahan, PA-C | 1811523988 | Physician Assistant | Evanston, IL | 2020 |
| Austin Callahan, PSS | 1508634718 | Peer Specialist | Louisa, KY | 2023 |
| Austin Callahan, PT | 1831436385 | Physical Therapist | Riverside, CA | 2013 |
| Avery Callahan, DO | 1407148737 | Emergency Medicine Physician | Fairhope, AL | 2011 |
| Bahinah Callahan | 1154958023 | Anesthesiology Physician | Milton, MA | 2020 |
| Bailey Callahan, MA | 1831838887 | Mental Health Counselor | Dubuque, IA | 2022 |
| Baily Callahan | 1316420961 | School Social Worker | Santa Clarita, CA | 2018 |
| Barbara Callahan, M.D. | 1124111653 | Internal Medicine Physician | West Hills, CA | 2006 |
| Barbara Callahan, PH.D. | 1134140965 | Counseling Psychologist | Topeka, KS | 2006 |
| Barbara Callahan, CRNA | 1215072335 | Certified Registered Nurse Anesthetist | Lebanon, NH | 2007 |
| Barbara Callahan, RN, CRNFA | 1861560179 | Registered Nurse First Assistant | Austin, TX | 2006 |
| Barry Callahan, MD | 1013989995 | Orthopaedic Hand Surgery Physician | Tuscaloosa, AL | 2006 |
| Benjamin Callahan, CRNA | 1043560485 | Certified Registered Nurse Anesthetist | Nashville, TN | 2012 |
| Benjamin Callahan | 1477124139 | Student in an Organized Health Care Education/Training Program | Richmond, TX | 2021 |
| Benjamin Callahan, MD | 1609923481 | Emergency Medicine Physician | Louisville, KY | 2007 |
| Bert Callahan, MD | 1760573927 | Orthopaedic Surgery Physician | Waupun, WI | 2006 |
| Beth Callahan, RN | 1114299161 | Registered Nurse | Greensburg, PA | 2012 |
| Beth Callahan, PT | 1699928028 | Pediatric Physical Therapist | Diamond Point, NY | 2008 |
| Bethany Callahan, PA-C | 1598478950 | Physician Assistant | Columbus, OH | 2023 |
| Betsy Callahan, DSW LCSW | 1609986496 | Clinical Social Worker | Hill Afb, UT | 2006 |
| Betty Callahan | 1528118056 | Optician | Huntington Station, NY | 2007 |
| Blake Callahan, MD | 1326617002 | Student in an Organized Health Care Education/Training Program | Orlando, FL | 2021 |
| Bonnie Callahan, M.D. | 1073728218 | Internal Medicine Physician | Newark, DE | 2007 |
| Boyce Callahan, D.C. | 1740434745 | Chiropractor | Anniston, AL | 2008 |
| Boyce Callahan, DC | 1982719449 | Chiropractor | Anniston, AL | 2006 |
| Boyd Callahan, M.S.W. | 1043326143 | Clinical Social Worker | Roselle, IL | 2006 |
| Bradley Callahan, LCSW | 1841995693 | Clinical Social Worker | Clearwater, FL | 2023 |
| Brandon Callahan, MED | 1346648862 | Case Manager/Care Coordinator | Corbin, KY | 2014 |
| Brandon Callahan, M.D. | 1427316355 | Diagnostic Radiology Physician | Fort Worth, TX | 2012 |
| Brandon Callahan | 1902290398 | Behavior Analyst | Manhattan, KS | 2015 |
| Brenda Callahan, ARNP-BC | 1144653353 | Nurse Practitioner | Annapolis, MD | 2013 |
| Brenna Callahan | 1235977430 | Nurse Practitioner | Boston, MA | 2024 |
| Brenna Callahan, BS | 1538311469 | Pediatric Occupational Therapist | Beaverton, OR | 2008 |
| Brenna Callahan | 1871148668 | Clinical Social Worker | Quincy, MA | 2019 |
| Brennah Callahan, PA | 1730995283 | Physician Assistant | Perrysburg, OH | 2024 |
| Brian Callahan, M.D. | 1013059625 | Diagnostic Radiology Physician | Lackland A F B, TX | 2007 |
| Brian Callahan | 1083328991 | Professional Counselor | Cleveland, OH | 2023 |
| Brian Callahan, M.D. | 1174558217 | Surgery Physician | Concord, MA | 2006 |
| Brian Callahan, P.A. | 1245415843 | Physician Assistant | Willsboro, NY | 2008 |
| Brian Callahan, MSN, APRN, FNP-C | 1396302964 | Family Nurse Practitioner | Clearwater, FL | 2019 |
| Brian Callahan, D.D.S. | 1629122692 | General Practice Dentistry | Vernal, UT | 2007 |
| Brian Callahan, D.C. | 1649633884 | Chiropractor | Acworth, GA | 2016 |
| Brian Callahan, CRNA | 1770530511 | Certified Registered Nurse Anesthetist | Sioux Falls, SD | 2006 |
| Brian Callahan, ICADC, LPCMH | 1841502630 | Professional Counselor | Wilmington, DE | 2010 |
| Brian Callahan | 1932153301 | Nurse Practitioner | Boiceville, NY | 2006 |
| Brian Callahan, MD | 1982750576 | Neurological Surgery Physician | Tucson, AZ | 2007 |
| Brian Callahan, O.D. | 1992839088 | Optometrist | Pearl, MS | 2007 |
| Briana Callahan | 1932782281 | Mental Health Counselor | Needham, MA | 2021 |
| Brianna Callahan, MD | 1396634283 | Student in an Organized Health Care Education/Training Program | Southfield, MI | 2025 |
| Brianna Callahan, RBT | 1841896537 | Behavior Technician | Litchfield Park, AZ | 2020 |
| Bridget Callahan | 1194310904 | Occupational Therapist | Washington, DC | 2021 |
| Brigid Callahan | 1780555961 | Behavior Technician | Hamden, CT | 2025 |
| Brittany Callahan, NP | 1386426807 | Pediatric Nurse Practitioner | Selden, NY | 2023 |
| Brittany Callahan, LAC | 1518648815 | Mental Health Counselor | Phoenix, AZ | 2023 |
| Brittany Callahan, PSCW-1285 | 1528905767 | Clinical Social Worker | Lander, WY | 2026 |
| Brittany Callahan, PA-C | 1790258614 | Physician Assistant | Phoenix, AZ | 2019 |
| Brittany Callahan | 1851026843 | Nurse Practitioner | Melbourne, FL | 2022 |
| Brittney Callahan | 1528523495 | Case Manager/Care Coordinator | University Place, WA | 2019 |
| Brittney Callahan, NP-C | 1932770732 | Family Nurse Practitioner | Nakina, NC | 2021 |
| Brooke Callahan, CRNP | 1013799576 | Acute Care Nurse Practitioner | Philadelphia, PA | 2023 |
| Brooke Callahan | 1144065871 | Developmental Therapist | Milford, MA | 2024 |
| Brooke Callahan | 1962220889 | Personal Care Attendant | Las Vegas, NV | 2024 |
| Brooklin Callahan, FNP | 1376135830 | Family Nurse Practitioner | South Boston, VA | 2021 |
| Bruce Callahan, CSAC | 1366950131 | Addiction (Substance Use Disorder) Counselor | Richmond, VA | 2018 |
| Bryan Callahan, PT, DPT | 1871103549 | Physical Therapist | Broadway, VA | 2020 |
| Bryanna Callahan, LCSW | 1740996172 | Clinical Social Worker | Chula Vista, CA | 2023 |
| Bryon Callahan, M.D. | 1659717734 | Emergency Medicine Physician | Houston, TX | 2013 |
| Burton Callahan | 1437612116 | Professional Counselor | Hartford, CT | 2019 |
| Caitlin Callahan, RSA | 1386321438 | Mental Health Counselor | Dekalb, IL | 2023 |
| Caitlin Callahan | 1437718681 | Behavior Technician | Montclair, CA | 2019 |
| Caitlin Callahan, DDS | 1679093264 | General Practice Dentistry | Greenville, SC | 2017 |
| Caitlin Callahan | 1952183808 | Clinical Social Worker | Rochester, MN | 2023 |
| Caitlyn Callahan | 1265073613 | Student in an Organized Health Care Education/Training Program | Clintondale, NY | 2019 |
| Callie Callahan, APRN | 1144565433 | Adult Health Nurse Practitioner | Osawatomie, KS | 2012 |
| Cameo Callahan, DNP, APRN, FNP-BC | 1447143078 | Family Nurse Practitioner | Jacksonville, FL | 2025 |
| Cameron Callahan | 1366143778 | Student in an Organized Health Care Education/Training Program | New York, NY | 2023 |
| Cameron Callahan, MD | 1538781091 | Student in an Organized Health Care Education/Training Program | Chapel Hill, NC | 2020 |
| Camille Callahan | 1801419957 | Behavior Analyst | Camarillo, CA | 2020 |
| Carinne Callahan | 1194907287 | Physical Therapist | Boston, MA | 2007 |
| Carl Callahan, CNP | 1750755849 | Family Nurse Practitioner | Saint Louis, MO | 2015 |
| Carly Callahan | 1437040946 | Behavior Technician | Columbia, MD | 2025 |
| Carly Callahan, MD | 1881416915 | Student in an Organized Health Care Education/Training Program | San Francisco, CA | 2024 |
| Carol Callahan, L.P.N. | 1316214398 | Licensed Practical Nurse | Horseheads, NY | 2011 |
| Carol Callahan, DPM | 1861485633 | Podiatrist | Fairfield, CT | 2005 |
| Caroline Callahan | 1154287555 | Behavior Technician | St Petersburg, FL | 2025 |
| Caroline Callahan, LMP | 1285857441 | Massage Therapist | Spokane, WA | 2007 |
| Caroline Callahan | 1295616910 | Clinical Social Worker | Erdenheim, PA | 2025 |
| Caroline Callahan | 1699624528 | Mental Health Counselor | New York, NY | 2026 |
| Caroline Callahan, PT, DPT | 1720633993 | Physical Therapist | Sun City Center, FL | 2019 |
| Caroline Callahan, MS | 1861114449 | Marriage & Family Therapist | Evanston, IL | 2022 |
| Caroline Callahan | 1962913525 | Nurse Practitioner | Boston, MA | 2017 |
| Carolyn Callahan, L.C.S.W. | 1104055011 | Clinical Social Worker | Roselle, IL | 2009 |
| Carolyn Callahan, LCSW | 1114084217 | Clinical Social Worker | Smithtown, NY | 2007 |
| Carolyn Callahan, LSW, CEAP, ACSW | 1174766232 | Social Worker | Pittsburgh, PA | 2009 |
| Carolyn Callahan, OTR/L | 1598481558 | Neurorehabilitation Occupational Therapist | Brookfield, WI | 2022 |
| Carrie Callahan, PHARMD | 1013856426 | Pharmacotherapy Pharmacist | Atlanta, GA | 2026 |
| Carrie Callahan, CT, MFTT | 1760973622 | Mental Health Counselor | Cleveland, OH | 2018 |
| Carrie Callahan, LCSW | 1841090644 | Mental Health Counselor | Bradenton, FL | 2025 |
| Casey Callahan | 1134886310 | Addiction (Substance Use Disorder) Counselor | Springfield, OR | 2021 |
| Casey Callahan | 1184286791 | Neonatal Nurse Practitioner | Indianapolis, IN | 2019 |
| Casey Callahan, MD | 1225657919 | Family Medicine Physician | Somerville, MA | 2020 |
| Casey Callahan | 1316677248 | Pharmacy Technician | Batesville, AR | 2022 |
| Casey Callahan | 1760884506 | Occupational Therapist | Plymouth, MI | 2014 |
| Cassandra Callahan, CNP | 1235091299 | Family Nurse Practitioner | Rapid City, SD | 2025 |
| Cassandra Callahan, RN | 1780322347 | Registered Nurse | Niagara, WI | 2022 |
| Cassandra Callahan, CF-SLP | 1992641765 | Speech-Language Pathologist | North Platte, NE | 2026 |
| Cassidy Callahan | 1295125581 | Physician Assistant | Syracuse, NY | 2015 |
| Catherine Callahan, M.S., CCC-SLP | 1023135696 | Speech-Language Pathologist | Chicago, IL | 2007 |
| Catherine Callahan, CPC, AAC | 1073668141 | Mental Health Counselor | Auburn, WA | 2007 |
| Catherine Callahan, PA | 1083159917 | Physician Assistant | Austin, TX | 2017 |
| Catherine Callahan, MD | 1407870926 | Internal Medicine Physician | Charlotte, NC | 2006 |
| Catherine Callahan | 1568010361 | Speech-Language Pathologist | Hurst, TX | 2019 |
| Catherine Callahan | 1598394314 | Mental Health Counselor | Greenville, GA | 2020 |
| Cathleen Callahan, MD | 1235308354 | Obstetrics & Gynecology Physician | Blacksburg, VA | 2008 |
| Cathleen Callahan, LCSW | 1336765593 | Clinical Social Worker | Framingham, MA | 2020 |
| Cathleen Callahan | 1487317129 | Mental Health Counselor | Sayville, NY | 2021 |
| Cathleen Callahan | 1861014243 | Social Worker | Melville, NY | 2020 |
| Cathryn Callahan, MS, LAT, ATC | 1952299497 | Athletic Trainer | Louisville, KY | 2025 |
| Cecilia Callahan, MD | 1528098464 | Anesthesiology Physician | Baltimore, MD | 2006 |
| Chad Callahan | 1528532611 | Physical Medicine & Rehabilitation Physician | Dayton, OH | 2019 |
| Chad Callahan, DMD, M.S. | 1578993184 | Orthodontics and Dentofacial Orthopedics Dentistry | Pensacola, FL | 2013 |
| Charlene Callahan | 1427696160 | Personal Care Attendant | Las Vegas, NV | 2019 |
| Charles Callahan, M.D. | 1023095510 | Infectious Disease Physician | Cape Coral, FL | 2005 |
| Charles Callahan, DO | 1295823557 | Pediatric Pulmonology Physician | Washington, DC | 2006 |
| Charles Callahan, MD | 1477577302 | Pediatric Emergency Medicine (Pediatrics) Physician | Providence, RI | 2006 |
| Charles Callahan, PH.D. | 1497823553 | Cognitive & Behavioral Psychologist | West Hempstead, NY | 2006 |
| Charles Callahan, PHD | 1629086426 | Clinical Psychologist | Springfield, IL | 2006 |
| Cheryl Callahan, DDS | 1013032903 | Dentist | Rockville, MD | 2007 |
| Cheryl Callahan | 1689396467 | Health & Wellness Coach | Laurel, MD | 2022 |
| Christina Callahan, COTA/L | 1033810296 | Occupational Therapist | Lima, OH | 2023 |
| Christina Callahan | 1255970570 | Audiologist-Hearing Aid Fitter | New York, NY | 2020 |
| Christina Callahan | 1477296754 | Nursing Home Administrator | Woolrich, PA | 2022 |
| Christina Callahan, DC | 1649339474 | Chiropractor | Campbell, CA | 2006 |
| Christina Callahan, CRNA | 1861979957 | Certified Registered Nurse Anesthetist | Nashville, TN | 2018 |
| Christina Callahan | 1942944301 | Student in an Organized Health Care Education/Training Program | Chester, PA | 2022 |
| Christine Callahan, PHD, MSW | 1013729474 | Clinical Social Worker | Ballston Spa, NY | 2025 |
| Christine Callahan, PHARMD | 1235410606 | Pharmacist | Orland Park, IL | 2011 |
| Christine Callahan, CNM | 1255984704 | Midwife | Fairfax, VA | 2019 |
| Christine Callahan, MD | 1811910581 | Ophthalmology Physician | Hershey, PA | 2006 |
| Christopher Callahan, MD | 1104867043 | Geriatric Medicine (Internal Medicine) Physician | Indianapolis, IN | 2006 |
| Christopher Callahan, MD | 1134822935 | Student in an Organized Health Care Education/Training Program | Saint Louis, MO | 2023 |
| Christopher Callahan, LCSW, CASAC | 1316420714 | Clinical Social Worker | Port Jefferson, NY | 2018 |
| Christopher Callahan, NP | 1366335325 | Nurse Practitioner | North Reading, MA | 2025 |
| Christopher Callahan, M.D. | 1417937491 | Emergency Medicine Physician | Plymouth, MN | 2006 |
| Christopher Callahan, MOT, OTR/L | 1851779094 | Pediatric Occupational Therapist | San Diego, CA | 2015 |
| Christopher Callahan, LCSW | 1952795650 | Clinical Social Worker | Sound Beach, NY | 2015 |
| Christopher Callahan, D.C. | 1972586519 | Chiropractor | Silvis, IL | 2005 |
| Christy Callahan, PMHNP-BC, CRNP | 1508237512 | Psychiatric/Mental Health Nurse Practitioner | Severna Park, MD | 2015 |
| Cierra Callahan | 1639982689 | Behavior Technician | Indianapolis, IN | 2025 |
| Cindy Callahan, RPA-C | 1013162510 | Physician Assistant | Nesconset, NY | 2008 |
| Claiborne Callahan, M.D. | 1033117981 | Ophthalmology Physician | Leesburg, VA | 2005 |
| Claire Callahan | 1629744396 | Occupational Therapist | Orland Park, IL | 2021 |
| Claire Callahan | 1720949050 | Social Worker | Brooklyn, NY | 2025 |
| Claire Callahan, MA, LPC | 1912712977 | Professional Counselor | Burr Ridge, IL | 2025 |
| Clara Callahan, MD | 1588718605 | General Practice Physician | Philadelphia, PA | 2007 |
| Clarissa Callahan | 1245166743 | Mental Health Counselor | Yuma, AZ | 2026 |
| Clay Callahan, DPT | 1689017337 | Physical Therapist | Nashville, TN | 2013 |
| Clinton Callahan, DMD | 1245331552 | Pediatric Dentistry | Colorado Springs, CO | 2006 |
| Clinton Callahan, LCSW | 1346704897 | Clinical Social Worker | Colorado Springs, CO | 2019 |
| Cody Callahan | 1013467729 | Electroneurodiagnostic Specialist/Technologist | San Antonio, TX | 2016 |
| Colin Callahan | 1295265270 | Behavior Technician | Kansas City, MO | 2017 |
| Colleen Callahan, CADC II | 1104394709 | Addiction (Substance Use Disorder) Counselor | Banning, CA | 2018 |
| Colleen Callahan, LCSW | 1225364441 | Clinical Social Worker | Littleton, CO | 2009 |
| Colleen Callahan | 1245703222 | Behavior Technician | Tacoma, WA | 2019 |
| Colleen Callahan, LPN | 1275744880 | Licensed Practical Nurse | Fort Pierce, FL | 2007 |
| Colleen Callahan, RN, CRNP | 1407064041 | Family Nurse Practitioner | Philadelphia, PA | 2007 |
| Colleen Callahan, M.ED., BCBA, LABA | 1447053301 | Behavior Analyst | Worcester, MA | 2025 |
| Colleen Callahan, M.S. CCC-SLP | 1679140735 | Speech-Language Pathologist | Ventnor City, NJ | 2021 |
| Colleen Callahan, LCSW | 1689991234 | Clinical Social Worker | Merritt Island, FL | 2010 |
| Connie Callahan, RN | 1770103566 | Registered Nurse | Vancouver, WA | 2020 |
| Connie Callahan, ARNP | 1891867743 | Registered Nurse | Lake City, FL | 2006 |
| Connor Callahan | 1285598797 | Physical Therapist | Chicago, IL | 2025 |
| Connor Callahan | 1497237614 | Marriage & Family Therapist | Evanston, IL | 2018 |
| Connor Callahan, MD | 1689194607 | Surgery Physician | Saint Louis, MO | 2017 |
| Corey Callahan, PT, DPT, OCS | 1588293435 | Physical Therapist | Lancaster, OH | 2020 |
| Cori Callahan, OD | 1396872560 | Optometrist | Price, UT | 2007 |
| Cori Callahan, MA, LPC, RBT | 1427552264 | Professional Counselor | Live Oak, TX | 2018 |
| Cory Callahan | 1073245551 | General Practice Dentistry | Ellicott City, MD | 2022 |
| Cory Callahan, PA-C | 1932647112 | Surgical Physician Assistant | Johnson City, TN | 2017 |
| Courtney Callahan, PT, DPT | 1245909126 | Physical Therapist | Kansas City, KS | 2021 |
| Courtney Callahan, OTR | 1366093155 | Occupational Therapist | Rockville, MD | 2019 |
| Courtney Callahan, LPC | 1619588381 | Mental Health Counselor | Richland Hills, TX | 2020 |
| Courtney Callahan, RPH | 1942922711 | Pharmacist | Rockland, MA | 2022 |
| Cristin Callahan | 1669139929 | Mental Health Counselor | Saint Paul, MN | 2021 |
| Cristina Callahan, PSY.D. | 1467961243 | Psychologist | Hollywood, FL | 2017 |
| Cristina Callahan, MSW | 1679320261 | Clinical Social Worker | North Kingstown, RI | 2024 |
| Cynthia Callahan, M.D. | 1134344799 | Pulmonary Disease Physician | Pittsfield, MA | 2007 |
| Cynthia Callahan, OTR/L | 1225705486 | Occupational Therapist | North Chesterfield, VA | 2021 |
| Cynthia Callahan, L.M.P. | 1609044700 | Massage Therapist | Vancouver, WA | 2008 |
| Dakota Callahan, CSW, MSW | 1336785831 | Clinical Social Worker | Saint George, UT | 2019 |
| Dana Callahan | 1417416231 | Internal Medicine Physician | Boston, MA | 2019 |
| Dana Callahan, LCSW | 1639607641 | Social Worker | Waterbury, CT | 2017 |
| Danice Callahan, LPN | 1114283470 | Licensed Practical Nurse | Dayton, OH | 2012 |
| Daniel Callahan, RPH | 1053525949 | Pharmacist | Rindge, NH | 2007 |
| Daniel Callahan, LAC | 1063164374 | Mental Health Counselor | Glen Rock, NJ | 2022 |
| Daniel Callahan, DPM | 1093782286 | Podiatrist | North Andover, MA | 2006 |
| Daniel Callahan, DPM | 1184627770 | Foot & Ankle Surgery Podiatrist | Beavercreek, OH | 2005 |
| Daniel Callahan, D.M.D | 1245495431 | Dentist | Worcester, MA | 2008 |
| Daniel Callahan, MD | 1255580593 | Pain Medicine (Psychiatry & Neurology) Physician | Sullivan, IN | 2008 |
| Daniel Callahan, PA-C | 1265998439 | Physician Assistant | Peachtree City, GA | 2019 |
| Daniel Callahan, MCAP, MSW, ICRC-ADC | 1306394283 | Addiction (Substance Use Disorder) Counselor | Fort Myers, FL | 2016 |
| Daniel Callahan, LAC | 1487111035 | Acupuncturist | Mt Pleasant, WI | 2019 |
| Daniel Callahan | 1497225528 | Peer Specialist | Seattle, WA | 2018 |
| Daniel Callahan, CRPA | 1528812989 | Addiction (Substance Use Disorder) Counselor | Utica, NY | 2024 |
| Daniel Callahan, PHD | 1568612091 | Mental Health Counselor | Jacksonville, FL | 2008 |
| Daniel Callahan, M.D. | 1598761223 | Pulmonary Disease Physician | Alpharetta, GA | 2005 |
| Daniel Callahan, PT, DPT | 1821572777 | Physical Therapist | Richmond, VA | 2018 |
| Danielle Callahan, R.M.T | 1033343959 | Massage Therapist | Colorado Springs, CO | 2009 |
| Danielle Callahan | 1114759651 | Behavior Technician | Washington, DC | 2024 |
| Danielle Callahan | 1134801962 | Case Manager/Care Coordinator | Plainview, NY | 2023 |
| Danielle Callahan, PA | 1144243122 | Physician Assistant | Royersford, PA | 2006 |
| Danielle Callahan | 1205287158 | Behavior Analyst | Oak Harbor, WA | 2016 |
| Danielle Callahan, DPT | 1245042720 | Physical Therapist | Independence, MO | 2025 |
| Danielle Callahan, APRN | 1326747494 | Family Nurse Practitioner | Tampa, FL | 2023 |
| Danielle Callahan | 1467645135 | Specialist | Long Beach, CA | 2007 |
| Danielle Callahan, CRNP | 1750487724 | Acute Care Nurse Practitioner | Philadelphia, PA | 2006 |
| Danielle Callahan | 1841847977 | Mental Health Counselor | Clarkston, WA | 2019 |
| Danielle Callahan, LCSW | 1942547484 | Clinical Social Worker | Mechanicsburg, PA | 2013 |
| Danny Callahan | 1144821208 | Addiction (Substance Use Disorder) Counselor | Pekin, IL | 2020 |
| Darby Callahan, PHD | 1134446479 | Psychologist | White Plains, NY | 2010 |
| Darci Callahan, LMFT | 1912424078 | Marriage & Family Therapist | Charlotte, NC | 2017 |
| Darleen Callahan, RN | 1609014398 | Registered Nurse | Poughkeepsie, NY | 2009 |
| Daryl Callahan, D.O. | 1669574075 | Family Medicine Physician | Neptune, NJ | 2006 |
| David Callahan, PH.D. | 1205865797 | Psychologist | Sandwich, MA | 2006 |
| David Callahan, D.O. | 1386660157 | Critical Care Medicine (Internal Medicine) Physician | West Grove, PA | 2006 |
| David Callahan | 1437465416 | Clinical Social Worker | Brighton, MA | 2010 |
| David Callahan, MD | 1902992696 | Neurology with Special Qualifications in Child Neurology Physician | Saint Louis, MO | 2006 |
| Davina Callahan | 1265185581 | Clinical Social Worker | Washington, DC | 2022 |
| Dawn Callahan, COTA | 1326390774 | Occupational Therapy Assistant | Richmond, IN | 2012 |
| Deborah Callahan, LCSW | 1871981449 | Clinical Social Worker | Philadelphia, PA | 2015 |
| Debra Callahan, MD | 1386668341 | Clinical Pathology/Laboratory Medicine Physician | Bellingham, WA | 2006 |
| Debra Callahan, DC | 1457431652 | Chiropractor | Jonesboro, AR | 2006 |
| Debra Callahan, DC | 1841363256 | Chiropractor | Ventura, CA | 2006 |
| Deirdre Callahan, DNP, WHNP-BC | 1811715816 | Women's Health Nurse Practitioner | Fall River, MA | 2024 |
| Deirdre Callahan | 1851935894 | Psychiatric/Mental Health Registered Nurse | Attleboro, MA | 2019 |
| Denis Callahan, MSW, LGSW | 1134364672 | Clinical Social Worker | Nashua, NH | 2008 |
| Denise Callahan, P.T. | 1225188717 | Physical Therapist | Napa, CA | 2007 |
| Denise Callahan | 1598519829 | Peer Specialist | Lompoc, CA | 2024 |
| Dennis Callahan, MD | 1154390417 | Orthopaedic Foot and Ankle Surgery Physician | Coon Rapids, MN | 2006 |
| Derwin Callahan | 1518478353 | Community Health Worker | Lake Placid, FL | 2017 |
| Devin Callahan, PSYD | 1699812743 | Clinical Psychologist | San Diego, CA | 2007 |
| Devon Callahan, M.D | 1528315181 | Surgery Physician | Los Angeles, CA | 2012 |
| Diana Callahan, MSPT | 1275791519 | Physical Therapist | Golden, CO | 2008 |
| Diane Callahan, RDH | 1942441944 | Dental Hygienist | Beloit, WI | 2009 |
| Dominic Callahan, PH.D. | 1336356518 | Psychologist | Coral Springs, FL | 2007 |
| Donald Callahan, DDS | 1952431652 | General Practice Dentistry | Mendham, NJ | 2007 |
| Donna Callahan | 1992282115 | Adult Health Nurse Practitioner | Springfield, MA | 2018 |
| Dorian Callahan, LPCC | 1023318722 | Professional Counselor | Pomeroy, OH | 2010 |
Source: CMS National Plan and Provider Enumeration System (NPPES) (download.cms.gov). A listing is not a recommendation: check a license with the state board (license lookups).