Providers Katie Callahan, LGPC to Michelle Callahan, LMHP
300 individual NPIs in the federal registry, part 3,168 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. 77 link to a page of their own with Medicare and CMS data the registry does not carry.
| Provider | NPI | Specialty | Practice city | NPI issued |
|---|---|---|---|---|
| Katie Callahan, LGPC | 1447836853 | Mental Health Counselor | Columbia, MD | 2021 |
| Katie Callahan, PHARMD | 1518506401 | Pharmacist | Waterloo, IA | 2019 |
| Katie Callahan | 1760918049 | Mental Health Counselor | San Luis Obispo, CA | 2017 |
| Katlyn Callahan | 1174926778 | Optometrist | Cincinnati, OH | 2014 |
| Kay Callahan, RN FNP | 1194890384 | Family Nurse Practitioner | Liverpool, NY | 2006 |
| Kayla Callahan, MS RD | 1033555339 | Registered Dietitian | Plainsboro, NJ | 2013 |
| Kayla Callahan, BCBA | 1841796877 | Behavior Analyst | Portsmouth, NH | 2018 |
| Kayleigh Callahan | 1538940309 | Behavior Technician | Fairfield, CA | 2023 |
| Kaylie Callahan | 1366304974 | Massage Therapist | Taylorville, IL | 2025 |
| Keagan Callahan | 1548187792 | Student in an Organized Health Care Education/Training Program | Omaha, NE | 2026 |
| Keelyn Callahan | 1083574321 | Counselor | Corvallis, OR | 2025 |
| Keisha Callahan, RN, FNP-C | 1053128769 | Family Nurse Practitioner | Uvalda, GA | 2024 |
| Keith Callahan, M.D. | 1629063219 | Family Medicine Physician | Warwick, RI | 2005 |
| Keith Callahan | 1992083661 | Case Manager/Care Coordinator | West Liberty, KY | 2011 |
| Kelle Callahan | 1497035240 | Community Health Worker | Omaha, NE | 2011 |
| Kelley Callahan, PHD | 1477366219 | Clinical Psychologist | Berkeley, CA | 2025 |
| Kelley Callahan, PSY.D | 1780906206 | Psychologist | Greenville, OH | 2010 |
| Kelly Callahan, CF-SLP | 1194327841 | Speech-Language Pathologist | Santa Fe, NM | 2020 |
| Kelly Callahan, MSN, FNP-C | 1235481037 | Family Nurse Practitioner | Kingwood, TX | 2012 |
| Kelly Callahan | 1265879530 | Social Worker | Lowell, MA | 2013 |
| Kelly Callahan | 1306305537 | Behavior Technician | Burlington, MA | 2019 |
| Kelly Callahan, CRNA | 1306934070 | Certified Registered Nurse Anesthetist | Bryn Mawr, PA | 2006 |
| Kelly Callahan, LISW | 1417990656 | Social Worker | Columbus, OH | 2006 |
| Kelly Callahan | 1508336363 | Behavior Technician | Metairie, LA | 2018 |
| Kelly Callahan, PT | 1518231299 | Physical Therapist | Orland Park, IL | 2012 |
| Kelly Callahan | 1629794755 | Clinical Social Worker | Charlotte, NC | 2022 |
| Kelly Callahan, PA-C | 1780952861 | Physician Assistant | Glens Falls, NY | 2011 |
| Kelly Callahan, MS CCC-SLP | 1851761258 | Speech-Language Pathologist | Omaha, NE | 2015 |
| Kelly Callahan | 1871274308 | Specialist | Albany, NY | 2023 |
| Kelly Callahan, MD | 1932399631 | Pediatrics Physician | Los Angeles, CA | 2007 |
| Kellyann Callahan, MA CCC-SLP | 1841313939 | Speech-Language Pathologist | Copley, OH | 2007 |
| Kelsey Callahan | 1407282957 | Clinical Social Worker | Natick, MA | 2013 |
| Kelsey Callahan | 1770288532 | Nurse Practitioner | Sonora, CA | 2023 |
| Kelsi Callahan, RDH | 1346818374 | Specialist | Reno, NV | 2021 |
| Kelsi Callahan, RN | 1477279396 | Registered Nurse | Gastonia, NC | 2022 |
| Kenisha Callahan | 1528842143 | Case Manager/Care Coordinator | Hammond, LA | 2023 |
| Kenneth Callahan, LCSW-R | 1578803391 | Clinical Social Worker | Brooklyn, NY | 2013 |
| Kerri Callahan, RN | 1659235554 | Registered Nurse | Providence, RI | 2025 |
| Kerri Callahan, LICSW | 1740763614 | Clinical Social Worker | Danvers, MA | 2018 |
| Kerry Callahan, DPT | 1700334026 | Physical Therapist | Rockville, MD | 2016 |
| Kerry Callahan, M.D. | 1902871932 | Family Medicine Physician | Portland, OR | 2006 |
| Kerry Callahan, LCSW | 1942522792 | Clinical Social Worker | Englewood, NJ | 2010 |
| Kevin Callahan, MD | 1023119211 | Emergency Medicine Physician | Tacoma, WA | 2006 |
| Kevin Callahan, D.O. | 1134125156 | Hematology & Oncology Physician | Camden, NJ | 2005 |
| Kevin Callahan | 1215055611 | Occupational Therapy Assistant | Broomall, PA | 2007 |
| Kevin Callahan, PHARMD | 1275162166 | Pharmacist | Rochester, NY | 2020 |
| Kevin Callahan, CRNA | 1336188218 | Certified Registered Nurse Anesthetist | Fargo, ND | 2006 |
| Kevin Callahan, C.R.N.A. | 1427077072 | Certified Registered Nurse Anesthetist | Cape Girardeau, MO | 2006 |
| Kevin Callahan | 1508215666 | Mechanotherapist | Portland, OR | 2016 |
| Kevin Callahan, BCBA-D | 1588128961 | Behavior Analyst | Denton, TX | 2019 |
| Kevin Callahan, PTA | 1679298962 | Physical Therapy Assistant | Hermitage, PA | 2022 |
| Kevin Callahan, DPT | 1801836358 | Physical Therapist | Hinsdale, IL | 2006 |
| Kevin Callahan, MD | 1962406249 | Diagnostic Radiology Physician | Lynn, MA | 2005 |
| Khadijah Callahan | 1801494851 | Physical Therapist | Bridgewater, NJ | 2020 |
| Kiley Callahan | 1124984711 | Behavior Technician | Glendale, CA | 2025 |
| Kiley Callahan, PHD | 1518682970 | Psychologist | New York, NY | 2022 |
| Kiley Callahan, FNP-C | 1659139814 | Family Nurse Practitioner | North Quincy, MA | 2024 |
| Kim Callahan, AU.D. | 1629125604 | Audiologist | Dickinson, ND | 2007 |
| Kim Callahan | 1982254926 | Clinical Social Worker | Bethpage, NY | 2019 |
| Kimberley Callahan | 1578447330 | Personal Care Attendant | Reno, NV | 2025 |
| Kimberly Callahan, DPT | 1154636108 | Physical Therapist | Roscoe, IL | 2010 |
| Kimberly Callahan | 1225727159 | Addiction (Substance Use Disorder) Counselor | Green Springs, OH | 2023 |
| Kimberly Callahan | 1255631628 | Mental Health Counselor | Las Vegas, NV | 2010 |
| Kimberly Callahan, FNP | 1427187442 | Family Medicine Physician | Brockton, MA | 2007 |
| Kimberly Callahan, FNP | 1457515835 | Family Nurse Practitioner | Lumberton, NC | 2008 |
| Kimberly Callahan, LMSW | 1801504857 | Clinical Social Worker | Denver, CO | 2022 |
| Kimberly Callahan | 1952791998 | Physical Therapist | Providence, RI | 2015 |
| Kimberly Callahan, PTA | 1982893400 | Physical Therapy Assistant | Harrison, AR | 2007 |
| Kip Callahan, MD | 1760232086 | Internal Medicine Physician | Columbia, SC | 2024 |
| Kip Callahan, PT, DPT | 1760314694 | Physical Therapist | San Antonio, TX | 2026 |
| Kristen Callahan, CRNA | 1023136439 | Certified Registered Nurse Anesthetist | Cincinnati, OH | 2007 |
| Kristen Callahan, M.A., M.F.T. | 1356487169 | Marriage & Family Therapist | Redwood City, CA | 2007 |
| Kristi Callahan, CADC-I | 1134966609 | Addiction (Substance Use Disorder) Counselor | Carson City, NV | 2024 |
| Kristie Callahan, FNP-C | 1093129231 | Family Nurse Practitioner | Jackson, MS | 2014 |
| Kristin Callahan, PH.D. | 1518270107 | Psychologist | New Orleans, LA | 2010 |
| Kristina Callahan, LPC | 1376946053 | Professional Counselor | Philadelphia, PA | 2014 |
| Kristine Callahan | 1174413645 | Home Health Aide | Cozad, NE | 2025 |
| Kristine Callahan | 1679039333 | Addiction (Substance Use Disorder) Counselor | Fullerton, CA | 2019 |
| Kristyn Callahan, M.S., CCC-SLP | 1124647110 | Speech-Language Pathologist | New Ipswich, NH | 2020 |
| Kristyn Callahan, LMT | 1508641994 | Massage Therapist | North Olmsted, OH | 2023 |
| Kristyn Callahan | 1548867807 | Behavior Technician | Columbia, MD | 2020 |
| Krystal Callahan, PA | 1134935448 | Physician Assistant | Bay Shore, NY | 2024 |
| Krysten Callahan | 1700692282 | Behavior Technician | Minneapolis, MN | 2024 |
| Krystina Callahan, MD | 1770214546 | Neurology Physician | Charleston, SC | 2022 |
| Kyle Callahan | 1235973157 | Anesthesiology Physician | Indianapolis, IN | 2024 |
| Kyle Callahan, PA-C | 1518434372 | Surgical Physician Assistant | Dallas, TX | 2018 |
| Kyle Callahan | 1811361397 | Physician Assistant | Satellite Beach, FL | 2015 |
| Kylie Callahan | 1609596964 | Behavior Technician | Tulsa, OK | 2022 |
| Kylie Callahan, LSW | 1710448238 | Social Worker | Danville, IL | 2019 |
| Lacey Callahan, BA MS MSW, LMSW US | 1285416628 | Clinical Social Worker | McAlester, OK | 2023 |
| Lakisha Callahan | 1851941405 | Marriage & Family Therapist | San Leandro, CA | 2019 |
| Lara Callahan, RDMS, PA-C | 1700065612 | Physician Assistant | Sacramento, CA | 2007 |
| Lashonda Callahan, RN,MSN,AGNP-C | 1346826914 | Adult Health Nurse Practitioner | Augusta, GA | 2021 |
| Latanya Callahan, M.ED., NCC, LPC | 1609315860 | Mental Health Counselor | Hammond, LA | 2017 |
| Latoya Callahan, DDS | 1801993530 | Orthodontics and Dentofacial Orthopedics Dentistry | Laurel, MD | 2006 |
| Laura Callahan, RN | 1649942111 | General Practice Registered Nurse | Fallston, MD | 2021 |
| Laura Callahan | 1679054480 | Occupational Therapist | Grand Haven, MI | 2018 |
| Laura Callahan, L.M.P. | 1770600579 | Massage Therapist | Kirkland, WA | 2007 |
| Laura Callahan, LPC | 1831595222 | Professional Counselor | Spring Lake, NJ | 2014 |
| Laura Callahan, NP | 1972136737 | Family Nurse Practitioner | Huntsville, AL | 2020 |
| Laureen Callahan, R.P.A-C | 1396013231 | Medical Physician Assistant | East Setauket, NY | 2011 |
| Laurel Callahan | 1376286237 | Student in an Organized Health Care Education/Training Program | Washington, DC | 2022 |
| Lauren Callahan | 1013599869 | Family Nurse Practitioner | Indianapolis, IN | 2021 |
| Lauren Callahan | 1265173249 | Anesthesiology Physician | Gainesville, FL | 2022 |
| Lauren Callahan, PSY.D. | 1427756055 | Clinical Child & Adolescent Psychologist | San Francisco, CA | 2023 |
| Lauren Callahan, M.D. | 1477711158 | Obstetrics & Gynecology Physician | Woodbury, MN | 2008 |
| Lauren Callahan, MA, LGPC | 1518769793 | Mental Health Counselor | Rockville, MD | 2025 |
| Lauren Callahan | 1942923370 | Social Worker | Newtown, PA | 2022 |
| Laurie Callahan, MSN, FNP-BC | 1194821751 | Family Nurse Practitioner | Medford, OR | 2006 |
| Laurie Callahan, RDH | 1568906519 | Dental Hygienist | Nellis Afb, NV | 2016 |
| Laurie Callahan | 1912682949 | Occupational Therapy Assistant | Nashville, TN | 2023 |
| Layla Callahan, RADT | 1720633589 | Addiction (Substance Use Disorder) Counselor | Grass Valley, CA | 2019 |
| Laysa Callahan | 1134705312 | Behavior Technician | King Of Prussia, PA | 2021 |
| Leah Callahan, LPC | 1891155966 | Mental Health Counselor | Tulsa, OK | 2016 |
| Leanna Callahan | 1558190983 | Behavior Analyst | New York, NY | 2024 |
| Leanne Callahan, COTA | 1649436437 | Occupational Therapy Assistant | Fort Myers, FL | 2008 |
| Lee Ann Callahan, PHD | 1780733824 | Clinical Psychologist | San Diego, CA | 2007 |
| Leigh Ann Callahan, MD | 1396855037 | Critical Care Medicine (Internal Medicine) Physician | Lexington, KY | 2006 |
| Leo Xavier Callahan, M.D. | 1598955627 | Otolaryngology Physician | East Boston, MA | 2007 |
| Leta Callahan, MD | 1154548881 | Adult Medicine Physician | Wheeler, OR | 2007 |
| Letha Callahan | 1720978927 | Behavior Technician | Petaluma, CA | 2025 |
| Leticia Callahan, CRNA | 1215301098 | Certified Registered Nurse Anesthetist | Hartford, CT | 2015 |
| Liam Callahan, NRP | 1205768934 | Emergency Medical Services (Emergency Medicine) Physician | Gardiner, ME | 2026 |
| Liberty Callahan | 1588473649 | Case Manager/Care Coordinator | Old Washington, OH | 2025 |
| Lili Callahan, PHARMD | 1427676360 | Pharmacist | Plano, TX | 2020 |
| Linda Callahan, LMFT | 1457679136 | Marriage & Family Therapist | Pasadena, CA | 2010 |
| Linda Callahan | 1477088136 | Speech-Language Pathologist | Loveland, OH | 2017 |
| Linda Callahan, RN, IBCLC | 1477351088 | Lactation Consultant (Registered Nurse) | Norfolk, VA | 2025 |
| Linda Callahan, PSY.D. | 1528118999 | Psychologist | Pleasant Hill, CA | 2007 |
| Linda Callahan, LCSW-C | 1538416003 | Clinical Social Worker | Baltimore, MD | 2012 |
| Linda Callahan, R.N., CRNA, PMHNP | 1578712568 | Psychiatric/Mental Health Nurse Practitioner | Klamath Falls, OR | 2008 |
| Linda Callahan, COTA | 1649668864 | Occupational Therapy Assistant | Charlotte, NC | 2014 |
| Linda Callahan, RD, LDN | 1689920456 | Registered Dietitian | Ringgold, GA | 2012 |
| Linda Callahan, MSW LCSW | 1932248051 | Clinical Social Worker | Gainesville, FL | 2007 |
| Lindsay Callahan | 1215826680 | Family Nurse Practitioner | Alpharetta, GA | 2025 |
| Lindsay Callahan, LMFT | 1346760238 | Marriage & Family Therapist | Colorado Springs, CO | 2017 |
| Lindsay Callahan | 1386348290 | Student in an Organized Health Care Education/Training Program | Barre, MA | 2023 |
| Lindsay Callahan, MD | 1689433815 | Student in an Organized Health Care Education/Training Program | New York, NY | 2024 |
| Lindsay Callahan, NP | 1821604885 | Family Nurse Practitioner | Midlothian, VA | 2020 |
| Lindsay Callahan | 1871976951 | Registered Nurse | Roscoe, IL | 2015 |
| Lindsey Callahan | 1134696172 | Addiction (Substance Use Disorder) Counselor | Mechanicsburg, PA | 2018 |
| Lindsey Callahan, PA-C | 1568944650 | Physician Assistant | Syracuse, NY | 2018 |
| Lindsey Callahan, PT | 1689074445 | Physical Therapist | Peoria, IL | 2014 |
| Lindsey Callahan | 1902203219 | Case Manager/Care Coordinator | Wilmington, OH | 2014 |
| Lindsey Callahan | 1992996698 | Mental Health Counselor | Essex, CT | 2007 |
| Lindy Callahan, DPT | 1265931588 | Physical Therapist | Cedar Falls, IA | 2018 |
| Lisa Callahan, CCC-SLP | 1215180872 | Speech-Language Pathologist | Troy, NY | 2008 |
| Lisa Callahan | 1275788812 | Speech-Language Pathologist | Brooklyn, NY | 2008 |
| Lisa Callahan, LSW | 1326118001 | Social Worker | Akron, OH | 2006 |
| Lisa Callahan | 1457587727 | Clinical Social Worker | Cheektowaga, NY | 2009 |
| Lisa Callahan, N.P. | 1528261583 | Adult Health Nurse Practitioner | Wakefield, MA | 2007 |
| Lisa Callahan, M.D. | 1598928434 | Specialist | New York, NY | 2008 |
| Lisa Callahan, RP | 1619253192 | Pharmacist | Cartersville, GA | 2011 |
| Lisa Callahan, RN, MSN, CPNP-PC | 1649261132 | Pediatric Nurse Practitioner | Grants Pass, OR | 2005 |
| Lisa Callahan, COTA/L | 1679162069 | Occupational Therapy Assistant | Jenks, OK | 2021 |
| Logan Callahan | 1497365175 | Behavior Technician | Caruthersville, MO | 2020 |
| Lois Callahan, LICSW | 1083668040 | Clinical Social Worker | Sagamore Beach, MA | 2006 |
| Lora Callahan, CHW | 1750247334 | Community Health Worker | Prestonsburg, KY | 2025 |
| Lorene Callahan, MSW | 1124446752 | Clinical Social Worker | Portland, OR | 2014 |
| Mackenzie Callahan | 1366288698 | Clinical Psychologist | Chelsea, MI | 2024 |
| Mackenzie Callahan | 1659858215 | Physical Therapy Assistant | Phoenix, AZ | 2018 |
| Mackenzie Callahan | 1770363491 | Behavior Technician | El Cajon, CA | 2023 |
| Mackenzie Callahan, WHNP | 1851230098 | Women's Health Nurse Practitioner | San Diego, CA | 2026 |
| Madina Callahan | 1801789193 | Case Manager/Care Coordinator | Washington, DC | 2025 |
| Madison Callahan | 1679426258 | Occupational Therapist | Richmond, IN | 2026 |
| Madison Callahan | 1750072021 | Behavior Technician | Riverview, FL | 2023 |
| Maeve Callahan, CRNP | 1073402038 | Adult Health Nurse Practitioner | Philadelphia, PA | 2025 |
| Maeve Callahan | 1801674031 | Social Worker | Springfield, MA | 2023 |
| Mai-Vi Callahan, PT, DPT, OCS | 1407143050 | Orthopedic Physical Therapist | Tequesta, FL | 2011 |
| Makayla Callahan | 1669318572 | Registered Nurse | Madison, AL | 2026 |
| Makenzie Callahan | 1154101723 | Occupational Therapist | Fitchburg, WI | 2023 |
| Maliyah Callahan | 1558993113 | Behavior Technician | Tucson, AZ | 2020 |
| Mallory Callahan, PA | 1437415130 | Physician Assistant | Omaha, NE | 2012 |
| Mallory Callahan, NP | 1528778214 | Nurse Practitioner | Stanford, CA | 2022 |
| Maren Callahan, R.D. | 1598048183 | Registered Dietitian | Elmira, NY | 2011 |
| Marganne Callahan, R.N. | 1366789752 | Registered Nurse | Franklin, WI | 2013 |
| Margaret Callahan, MD | 1508098534 | Medical Oncology Physician | Farmington, CT | 2009 |
| Margaret Callahan | 1689215808 | Social Worker | Littleton, CO | 2019 |
| Margaret Callahan, MD | 1699018176 | Pediatrics Physician | Rochester, NY | 2013 |
| Margaret Callahan | 1699213553 | Occupational Therapist | Aurora, CO | 2017 |
| Margret Callahan | 1144195892 | Acute Care Nurse Practitioner | Greenville, SC | 2025 |
| Marguerite Callahan, APN | 1215030564 | Adult Health Nurse Practitioner | Nashville, TN | 2006 |
| Maria Callahan, PT, DPT | 1184515975 | Physical Therapist | Lakeville, MN | 2025 |
| Maria Callahan | 1235462037 | Student in an Organized Health Care Education/Training Program | Berkeley, CA | 2009 |
| Maria Callahan, PA-C | 1356840805 | Physician Assistant | Flushing, NY | 2018 |
| Maria Callahan | 1831859578 | Student in an Organized Health Care Education/Training Program | Atlanta, GA | 2021 |
| Marian Callahan, L. AC | 1619191145 | Acupuncturist | Smithtown, NY | 2007 |
| Marianne Callahan, PH.D., L.M.F.T. | 1710011192 | Marriage & Family Therapist | Los Angeles, CA | 2007 |
| Marie Callahan, RPH | 1205025558 | Pharmacist | West Chester, PA | 2007 |
| Marijke Callahan | 1447655477 | Behavior Analyst | Danvers, MA | 2014 |
| Marilyn Callahan | 1700932100 | Marriage & Family Therapist | Oakland, CA | 2007 |
| Marion Callahan, LCDC | 1568906006 | Addiction (Substance Use Disorder) Counselor | Round Rock, TX | 2016 |
| Marisa Callahan | 1114529468 | Case Manager/Care Coordinator | Niles, OH | 2020 |
| Marissa Callahan, DPT | 1598306680 | Physical Therapist | Phoenix, AZ | 2019 |
| Marissa Callahan | 1700712205 | Mental Health Counselor | Yuma, AZ | 2026 |
| Mark Callahan, LMFT | 1063563245 | Marriage & Family Therapist | Victorville, CA | 2007 |
| Mark Callahan, MD | 1194803890 | Internal Medicine Physician | New York, NY | 2006 |
| Mark Callahan, SLP | 1215194915 | Speech-Language Pathologist | Pittsburgh, PA | 2008 |
| Marlene Callahan, PHARMD | 1659393619 | Pharmacist Clinician (PhC)/ Clinical Pharmacy Specialist | Providence, RI | 2006 |
| Marley Callahan | 1437076619 | Behavior Technician | Durham, NC | 2026 |
| Marsha Callahan, PT | 1053574814 | Pediatric Physical Therapist | Charleston, SC | 2008 |
| Mary Callahan, MS, CCC-SLP | 1073939500 | Speech-Language Pathologist | Saint Ignatius, MT | 2014 |
| Mary Callahan, L.C.S.W. | 1164877643 | Clinical Social Worker | Bronx, NY | 2016 |
| Mary Callahan, RN MSM CRNP | 1235216433 | Psychiatric/Mental Health Clinical Nurse Specialist | Moosic, PA | 2006 |
| Mary Callahan, M.D. | 1275508194 | Family Medicine Physician | State College, PA | 2006 |
| Mary Callahan, LMSW-CC | 1427386085 | Clinical Social Worker | South Portland, ME | 2009 |
| Mary Callahan, D.O. | 1518968882 | Cardiovascular Disease Physician | Sandwich, MA | 2005 |
| Mary Callahan, PTA | 1568292910 | Physical Therapy Assistant | Antioch, TN | 2024 |
| Mary Callahan | 1679550222 | Other Technician | Seattle, WA | 2005 |
| Mary Callahan, LMSW-ASP | 1760596027 | Clinical Social Worker | Dallas, TX | 2006 |
| Mary Callahan, ARNP | 1831151638 | Family Nurse Practitioner | Winter Park, FL | 2006 |
| Mary Callahan, P.A. | 1841632304 | Medical Physician Assistant | Stuart, FL | 2013 |
| Mary Callahan, MD | 1912116211 | Pediatrics Physician | Fredericksburg, VA | 2007 |
| Mary Callahan, M.D. | 1942629803 | Hospice and Palliative Medicine (Internal Medicine) Physician | New York, NY | 2014 |
| Mary Callahan, L.I.C.S.W. | 1992725550 | Clinical Social Worker | North Easton, MA | 2006 |
| Mary Callahan, N.P. | 1992739346 | Women's Health Nurse Practitioner | Racine, WI | 2006 |
| Mason Callahan | 1053104406 | Nurse Practitioner | Cincinnati, OH | 2025 |
| Matilda Callahan | 1760166318 | Personal Care Attendant | Las Vegas, NV | 2023 |
| Matthew Callahan, PTA | 1023604014 | Physical Therapy Assistant | Temple Terrace, FL | 2020 |
| Matthew Callahan, M.D. | 1083901839 | Hospitalist Physician | San Diego, CA | 2011 |
| Matthew Callahan, MPT, MTC | 1235136573 | Physical Therapist | New Castle, PA | 2005 |
| Matthew Callahan, PT, DPT | 1952843773 | Physical Therapist | Flushing, MI | 2016 |
| Matthew James Callahan, MD | 1811525256 | Emergency Medicine Physician | Fairhope, AL | 2020 |
| Maura Callahan, LMHC | 1467821215 | Mental Health Counselor | Lexington, MA | 2015 |
| Maureen Callahan, DDS | 1255484424 | General Practice Dentistry | Lackawanna, NY | 2007 |
| Maureen Callahan, LMSW | 1326550047 | Clinical Social Worker | Novi, MI | 2017 |
| Maureen Callahan, RPH | 1366611873 | Pharmacist | Mansfield, PA | 2008 |
| Maureen Callahan, NP | 1497633036 | Family Nurse Practitioner | Northampton, MA | 2025 |
| Maureen Callahan, LCSW | 1679046809 | Clinical Social Worker | Roscoe, IL | 2019 |
| Maureen Callahan, CRNA | 1972629905 | Certified Registered Nurse Anesthetist | Camden, NJ | 2007 |
| Maurice Callahan | 1538049309 | Case Manager/Care Coordinator | Long Beach, CA | 2025 |
| Meagan Callahan, PT, DPT | 1497307870 | Physical Therapist | El Segundo, CA | 2019 |
| Meaghan Callahan | 1629446638 | Developmental Therapist | Milford, MA | 2015 |
| Meaghan Callahan | 1902247257 | Women's Health Nurse Practitioner | Attleboro, MA | 2013 |
| Meg Callahan | 1679035224 | Assistant Behavior Analyst | South Hadley, MA | 2019 |
| Megan Callahan, OD | 1073189114 | Optometrist | Highlands Ranch, CO | 2021 |
| Megan Callahan, RDN, LDN | 1275084782 | Registered Dietitian | Grand Junction, CO | 2016 |
| Megan Callahan | 1295134575 | Occupational Therapist | Albany, NY | 2014 |
| Megan Callahan | 1336886043 | Social Worker | Weymouth, MA | 2022 |
| Megan Callahan, LICSW | 1417146564 | Clinical Social Worker | Brockton, MA | 2007 |
| Megan Callahan, PHD | 1497249908 | Counseling Psychologist | West Des Moines, IA | 2018 |
| Megan Callahan | 1578169975 | Case Manager/Care Coordinator | Ironton, OH | 2020 |
| Megan Callahan, LAT, ATC | 1649586801 | Athletic Trainer | Terre Haute, IN | 2010 |
| Megan Callahan | 1710399696 | Clinical Psychologist | Portland, OR | 2014 |
| Megan Callahan, M.D. | 1780642611 | Neurology Physician | Attleboro, MA | 2006 |
| Megan Callahan, M.D. | 1881662864 | Internal Medicine Physician | Everett, MA | 2006 |
| Megan Callahan, MS, RD, LD | 1982973129 | Registered Dietitian | Belton, MO | 2011 |
| Meghan Callahan | 1043832330 | Behavior Analyst | Jupiter, FL | 2020 |
| Meghan Callahan, LLMSW | 1245674613 | Clinical Social Worker | Waterford, MI | 2013 |
| Meghan Callahan | 1548024219 | Social Worker | Watertown, MA | 2024 |
| Meghan Callahan, OTR/L | 1861653040 | Occupational Therapist | Billerica, MA | 2008 |
| Meghan Callahan, D.O. | 1922802644 | Student in an Organized Health Care Education/Training Program | Sayre, PA | 2025 |
| Melanie Callahan, RN | 1245177047 | Registered Nurse | Bonaire, GA | 2026 |
| Melanie Callahan | 1336195577 | Physical Therapist | N Andover, MA | 2006 |
| Melanie Callahan | 1710635917 | Case Manager/Care Coordinator | Salt Lake City, UT | 2022 |
| Melinda Callahan | 1679039754 | Behavior Technician | Novi, MI | 2019 |
| Melinda Callahan | 1902613102 | Mental Health Counselor | Prestonsburg, KY | 2024 |
| Melissa Callahan, MS, OTR/L | 1083866693 | Pediatric Occupational Therapist | Philadelphia, PA | 2008 |
| Melissa Callahan | 1164319356 | Behavior Analyst | Abington, MA | 2025 |
| Melissa Callahan | 1326831884 | Home Health Aide | Upper Tract, WV | 2025 |
| Melissa Callahan | 1396387601 | Case Manager/Care Coordinator | Willoughby, OH | 2019 |
| Melissa Callahan, RN CDE | 1568619039 | Diabetes Educator Registered Nurse | Akron, OH | 2008 |
| Melissa Callahan, CRNP | 1669411393 | Gerontology Nurse Practitioner | Exton, PA | 2006 |
| Melissa Callahan | 1740520659 | Marriage & Family Therapist | Alexandria, VA | 2013 |
| Melissa Callahan, CRNA | 1780647602 | Certified Registered Nurse Anesthetist | Tunkhannock, PA | 2006 |
| Melissa Callahan, PA-C | 1780865931 | Physician Assistant | Hyden, KY | 2007 |
| Melissa Callahan, MD | 1861653438 | Student in an Organized Health Care Education/Training Program | Portsmouth, VA | 2008 |
| Melvia Callahan | 1407544893 | Home Health Aide | Augusta, GA | 2023 |
| Michael Callahan, DC | 1003408576 | Chiropractor | Clermont, FL | 2021 |
| Michael Callahan | 1023972684 | Marriage & Family Therapist | San Dimas, CA | 2025 |
| Michael Callahan, M.D. | 1063564243 | Otolaryngic Allergy Physician | Gainesville, GA | 2007 |
| Michael Callahan, DMD | 1083799266 | General Practice Dentistry | Lavonia, GA | 2006 |
| Michael Callahan, MD | 1104864651 | Orthopaedic Surgery Physician | Provo, UT | 2006 |
| Michael Callahan, CRNA | 1184622284 | Certified Registered Nurse Anesthetist | Albany, NY | 2005 |
| Michael Callahan | 1205578515 | Mental Health Counselor | New York, NY | 2022 |
| Michael Callahan, MD | 1285662668 | Pediatric Radiology Physician | Boston, MA | 2006 |
| Michael Callahan | 1356979538 | Physician Assistant | Fredericksburg, VA | 2020 |
| Michael Callahan, PA-C | 1467480673 | Gastroenterology Physician | Decatur, GA | 2006 |
| Michael Callahan, O.T. | 1477892255 | Occupational Therapist | Manahawkin, NJ | 2013 |
| Michael Callahan, PTA | 1518265321 | Physical Therapy Assistant | Cincinnati, OH | 2011 |
| Michael Callahan, MD | 1548396492 | Gynecologic Oncology Physician | Indianapolis, IN | 2007 |
| Michael Callahan, D.D.S | 1649244906 | Oral and Maxillofacial Surgery (Dentist) | Kingston, PA | 2006 |
| Michael Callahan, DO | 1730122425 | Family Medicine Physician | Galeton, PA | 2006 |
| Michael Callahan, M.D. | 1770698821 | Infectious Disease Physician | Cambridge, MA | 2006 |
| Michael Callahan, MSW | 1790572642 | Social Worker | Portage, IN | 2025 |
| Michael Callahan, MD | 1811421977 | Anesthesiology Physician | Fort Cavazos, TX | 2017 |
| Michael Callahan, DSW, MSW, LCSW | 1811589559 | Clinical Social Worker | Newark, NJ | 2021 |
| Michael Callahan, PA-C | 1891844148 | Physician Assistant | Saint Joseph, MI | 2007 |
| Michael Callahan, PA-C | 1902465321 | Physician Assistant | Reno, NV | 2019 |
| Michael Callahan, MD | 1902892151 | Ophthalmology Physician | Birmingham, AL | 2005 |
| Michaela Callahan, PHARMD | 1306448105 | Pharmacist | Westerville, OH | 2020 |
| Michaela Callahan, LMT | 1821987298 | Massage Therapist | Newport, ME | 2025 |
| Michaelene Callahan, D.C. | 1366564254 | Chiropractor | Ormond Beach, FL | 2007 |
| Michele Callahan, NP | 1609839430 | Family Nurse Practitioner | Carthage, MO | 2006 |
| Michele Callahan, M.D. | 1639411879 | Emergency Medicine Physician | Baltimore, MD | 2013 |
| Michelle Callahan, DDS | 1275037962 | Dentist | Garden City, NY | 2018 |
| Michelle Callahan | 1326857723 | Clinical Social Worker | Needham, MA | 2025 |
| Michelle Callahan, LSCSW, LCSW | 1417226945 | Clinical Social Worker | Liberty, MO | 2011 |
| Michelle Callahan, PHARMACIST | 1437472859 | Pharmacist | Southold, NY | 2010 |
| Michelle Callahan, LMHP | 1801787072 | Mental Health Counselor | Omaha, NE | 2025 |
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).