Providers Christopher Duffy to John Duffy, MD
300 individual NPIs in the federal registry, part 5,857 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. 105 link to a page of their own with Medicare and CMS data the registry does not carry.
| Provider | NPI | Specialty | Practice city | NPI issued |
|---|---|---|---|---|
| Christopher Duffy | 1407732076 | Social Worker | Manchester, CT | 2025 |
| Christopher Duffy | 1417423781 | Athletic Trainer | Arlington, MA | 2018 |
| Christopher Duffy | 1649522061 | Peer Specialist | Riverside, CA | 2012 |
| Christopher Duffy, PA | 1649817552 | Medical Physician Assistant | Sarasota, FL | 2019 |
| Christopher Duffy, D.D.S. | 1679786321 | Prosthodontics | Mamaroneck, NY | 2007 |
| Christopher Duffy | 1790135366 | Pharmacist | Sharon Hill, PA | 2016 |
| Christy Duffy, PHD | 1548417033 | Psychologist | Bloomington, IN | 2008 |
| Claire Duffy | 1144828195 | Occupational Therapist | Southbury, CT | 2020 |
| Claire Duffy | 1225338999 | Medical Physician Assistant | Salt Lake City, UT | 2010 |
| Clark Duffy | 1619102928 | Physical Therapist | Portland, OR | 2009 |
| Colette Duffy, LCSW | 1447809553 | Clinical Social Worker | Boston, MA | 2019 |
| Colin Duffy, MD | 1659010452 | Military Health Care Provider | Bethesda, MD | 2022 |
| Colin Duffy | 1669286639 | Mental Health Counselor | Fenton, MI | 2025 |
| Colleen Duffy | 1073361291 | Specialist | Westbury, NY | 2024 |
| Colleen Duffy, PH.D. | 1306983473 | Counseling Psychologist | Durham, NC | 2007 |
| Colleen Duffy, APN, PMHCNS-BC | 1346512209 | Child & Adolescent Psychiatric/Mental Health Clinical Nurse Specialist | Paramus, NJ | 2012 |
| Colleen Duffy, BCABA | 1649697673 | Behavior Analyst | Tucson, AZ | 2014 |
| Collin Duffy, PA-C | 1619699493 | Physician Assistant | Smithtown, NY | 2022 |
| Colter Duffy | 1952898793 | Physical Therapy Assistant | Salt Lake City, UT | 2018 |
| Conor Duffy, CADC-I | 1669186466 | Addiction (Substance Use Disorder) Counselor | Portland, OR | 2023 |
| Cora Duffy, MHPP | 1396140810 | Mental Health Counselor | Little Rock, AR | 2014 |
| Corin Duffy, BCBA | 1881425288 | Behavior Analyst | West Hempstead, NY | 2024 |
| Cortney Duffy, PH.D. | 1740763085 | Clinical Psychologist | Duluth, MN | 2018 |
| Courtney Duffy, APRN, CNM | 1083189823 | Advanced Practice Midwife | Sterling, IL | 2018 |
| Courtney Duffy, PA-C | 1720481245 | Physician Assistant | Edina, MN | 2014 |
| Craig Duffy, LPC | 1558401612 | Professional Counselor | Morristown, NJ | 2007 |
| Cristin Duffy | 1871917914 | Mental Health Counselor | Plymouth, MA | 2014 |
| Crystal Duffy, DO | 1235457003 | Pediatrics Physician | Port Matilda, PA | 2010 |
| Curielle Duffy, LCSW | 1679846901 | Clinical Social Worker | Denver, CO | 2012 |
| Cynthia Duffy, OTR | 1023163722 | Occupational Therapist | Honesdale, PA | 2007 |
| Cynthia Duffy | 1629301577 | School Social Worker | Tampa, FL | 2009 |
| Danae Duffy, LMFT | 1376156299 | Marriage & Family Therapist | Napa, CA | 2020 |
| Dani Duffy | 1548181506 | Basic Emergency Medical Technician | San Tan Valley, AZ | 2026 |
| Daniel Duffy, CRNA | 1033789326 | Certified Registered Nurse Anesthetist | Danvers, MA | 2021 |
| Daniel Duffy, PHARMD | 1053696013 | Pharmacist | Middleton, WI | 2011 |
| Daniel Duffy | 1215541123 | Behavior Analyst | Pittsburgh, PA | 2020 |
| Daniel Duffy, MD | 1235191511 | Family Medicine Physician | Cedarburg, WI | 2006 |
| Daniel Duffy | 1255149043 | Interpreter | Fairfield, CT | 2024 |
| Daniel Duffy, D.O. | 1275568016 | Physical Medicine & Rehabilitation Physician | Saginaw, MI | 2006 |
| Daniel Duffy, PA-C | 1285730648 | Physician Assistant | White River Junction, VT | 2006 |
| Daniel Duffy, LAT, ATC | 1366430118 | Athletic Trainer | Wilmington, NC | 2005 |
| Daniel Duffy, M.D. | 1437139573 | Reproductive Endocrinology Physician | Tampa, FL | 2006 |
| Daniel Duffy, D.M.D. | 1508213323 | General Practice Dentistry | Wilmington, NC | 2016 |
| Daniel Duffy, D.C. | 1568550481 | Chiropractor | Highland Heights, OH | 2006 |
| Daniel Duffy, SURIGICAL ASSIST(SA) | 1629471610 | Surgical Assistant | Castle Rock, CO | 2014 |
| Daniel Duffy, D.C. | 1649239583 | Chiropractor | Perry, IA | 2006 |
| Daniel Duffy, DPM | 1700827888 | Podiatrist | Lutherville, MD | 2006 |
| Daniel Duffy, MD | 1780657429 | Diagnostic Radiology Physician | Lackland A F B, TX | 2006 |
| Daniel Duffy | 1912576174 | Behavior Technician | Spokane Valley, WA | 2021 |
| Daniel Duffy, PT | 1942461991 | Physical Therapist | Nanuet, NY | 2008 |
| Daniel Duffy, PHARMD, RPH | 1982936829 | Pharmacist | Hampton Bays, NY | 2010 |
| Danielle Duffy | 1104570308 | Adult Health Nurse Practitioner | Port Washington, NY | 2022 |
| Danielle Duffy, LAT ATC | 1164077574 | Athletic Trainer | Glenside, PA | 2019 |
| Danielle Duffy | 1255285854 | Behavior Technician | Silver Spring, MD | 2026 |
| Danielle Duffy, M.D. | 1427094697 | Cardiovascular Disease Physician | Philadelphia, PA | 2006 |
| Danielle Duffy | 1780531558 | Professional Counselor | Fort Washington, PA | 2026 |
| Danielle Duffy | 1821797101 | Student in an Organized Health Care Education/Training Program | Charlottesville, VA | 2023 |
| Danielle Duffy | 1902350598 | Registered Nurse | Buffalo, NY | 2016 |
| Darlene Duffy | 1154668150 | Counselor | Altoona, PA | 2013 |
| Darlene Duffy, BA | 1821148982 | Case Manager/Care Coordinator | Chester, PA | 2007 |
| David Duffy, MSW | 1023313582 | Mental Health Counselor | Miami, FL | 2011 |
| David Duffy, OD | 1295778124 | Optometrist | Philadelphia, PA | 2006 |
| David Duffy, PHD | 1326244955 | Clinical Psychologist | La Mesa, CA | 2007 |
| David Duffy, MFT | 1396049458 | Marriage & Family Therapist | Brookings, OR | 2011 |
| David Duffy, RPH | 1457631905 | Pharmacist | Middleton, WI | 2011 |
| David Duffy | 1609348911 | Peer Specialist | North Olmsted, OH | 2018 |
| David Duffy, M.D. | 1801827647 | Internal Medicine Physician | Astoria, NY | 2006 |
| David Duffy, M.D. | 1861414203 | Emergency Medicine Physician | Greenbrae, CA | 2006 |
| Dawn Duffy, DC | 1912007048 | Chiropractor | Geneva, OH | 2006 |
| Deanna Duffy | 1073486510 | Nurse's Aide | Kearney, NE | 2025 |
| Debora Duffy, CRNA | 1265754691 | Certified Registered Nurse Anesthetist | Burnsville, MN | 2010 |
| Deborah Duffy, RN, BSN | 1154696854 | School Registered Nurse | Staten Island, NY | 2012 |
| Deborah Duffy, R.N. | 1386769982 | Registered Nurse | Patterson, NY | 2007 |
| Debra Duffy, LCSW-R | 1578176764 | Clinical Social Worker | New York, NY | 2020 |
| Debra Duffy, DDS | 1629040258 | Pediatric Dentistry | Flower Mound, TX | 2006 |
| Deirdre Duffy, M.D. | 1962475426 | Obstetrics & Gynecology Physician | Watertown, WI | 2006 |
| Denise Duffy, CNP | 1194219949 | Nurse Practitioner | Waverly, OH | 2018 |
| Denise Duffy, LCSW | 1326081423 | Clinical Social Worker | Miami, FL | 2006 |
| Denise Duffy, O.D. | 1659721231 | Optometrist | Clinton Twp, MI | 2016 |
| Dennis Duffy, P.A. | 1932136447 | Physician Assistant | Stony Brook, NY | 2006 |
| Derick Duffy | 1679353593 | Counselor | Lancaster, PA | 2023 |
| Diana Duffy, OTR/L | 1124426044 | Occupational Therapist | Oswego, NY | 2014 |
| Diane Duffy | 1194227017 | Hearing Instrument Specialist | Fair Oaks, CA | 2018 |
| Diane Duffy, NNP | 1669533758 | Neonatal Nurse Practitioner | Hendersonville, NC | 2006 |
| Dolores Duffy, LPN | 1417142910 | Licensed Practical Nurse | North Salem, NY | 2007 |
| Donata Duffy, B.S.W | 1447572789 | Social Worker | Indianapolis, IN | 2010 |
| Donna Duffy, PT | 1083732374 | Physical Therapist | Putnam, CT | 2007 |
| Donna Duffy, PH.D | 1215017926 | Psychologist | Winchester, MA | 2006 |
| Dorene Duffy | 1861552457 | Professional Counselor | Raleigh, NC | 2006 |
| Dorothy Duffy | 1033942446 | Speech-Language Pathologist | Chicago, IL | 2024 |
| Dorothy Duffy | 1144817164 | Pharmacist | Clifton, NJ | 2020 |
| Douglas Duffy, PAC | 1184707457 | Surgical Physician Assistant | Ada, OK | 2006 |
| Douglas Duffy, MD | 1366542227 | Nephrology Physician | Marshfield, WI | 2006 |
| Drew Duffy | 1285553362 | Behavior Analyst | Centennial, CO | 2026 |
| Dustin Duffy | 1184003022 | Physical Therapist | San Antonio, TX | 2015 |
| Eamon Duffy, MD | 1245720549 | Cardiovascular Disease Physician | New York, NY | 2018 |
| Edward Duffy, MD | 1205495884 | Radiation Oncology Physician | Columbia, SC | 2019 |
| Edward Duffy, MD | 1568516383 | Radiation Oncology Physician | Sumter, SC | 2007 |
| Eileen Duffy, M.D. | 1295881688 | Psychiatry Physician | Chattahoochee, FL | 2007 |
| Eileen Duffy | 1477930774 | Massage Therapist | Paramus, NJ | 2015 |
| Eileen Duffy, M.D. | 1689741753 | Psychiatry Physician | Anoka, MN | 2006 |
| Eileen Duffy | 1871953703 | Physical Therapist | Oak Park, IL | 2016 |
| Elaine Duffy, PHD PSYCHOLOGIST | 1972098085 | Psychologist | Wayland, MA | 2018 |
| Elijah Duffy | 1730736943 | Mental Health Counselor | McAlester, OK | 2019 |
| Elizabeth Duffy, PA-C | 1093068538 | Physician Assistant | Wilmington, NC | 2012 |
| Elizabeth Duffy, OTR/L | 1124286786 | Occupational Therapist | White Bear Lake, MN | 2008 |
| Elizabeth Duffy | 1184032674 | Adult Health Nurse Practitioner | Prince Frederick, MD | 2014 |
| Elizabeth Duffy | 1215651468 | Behavior Technician | Fairbanks, AK | 2022 |
| Elizabeth Duffy, PT | 1275533978 | Physical Therapist | Portland, OR | 2005 |
| Elizabeth Duffy, MSW, LCSW | 1306275755 | Clinical Social Worker | Leesburg, VA | 2013 |
| Elizabeth Duffy, R.N, | 1396867115 | Community Health Registered Nurse | Auburn, CA | 2007 |
| Elizabeth Duffy, OTR | 1477730836 | Pediatric Occupational Therapist | Chatham, NJ | 2008 |
| Elizabeth Duffy, LPCA | 1568704609 | Professional Counselor | Hickory, NC | 2013 |
| Elizabeth Duffy, LMHC | 1700602075 | Mental Health Counselor | Shelbyville, IN | 2024 |
| Elizabeth Duffy, AGNP | 1871045351 | Nurse Practitioner | Thomasville, NC | 2016 |
| Elizabeth Duffy, CPNP | 1942357009 | Pediatric Nurse Practitioner | Bloomfield Hills, MI | 2007 |
| Elizabeth Duffy, NPC | 1962870220 | Adult Health Nurse Practitioner | Hudson, NH | 2015 |
| Ellen Duffy, MS.ED | 1932824471 | Specialist | New York, NY | 2022 |
| Emer Duffy | 1255277349 | Behavior Technician | Brockton, MA | 2026 |
| Emily Duffy | 1013479674 | Hospice and Palliative Medicine (Internal Medicine) Physician | Middleton, WI | 2019 |
| Emily Duffy, BACB, LBA | 1073994679 | Behavior Analyst | Farmington, CT | 2015 |
| Emily Duffy, MD | 1306130539 | Dermatology Physician | Kansas City, MO | 2011 |
| Emily Duffy, DC | 1386311199 | Chiropractor | Corning, KS | 2021 |
| Emily Duffy, D.O. | 1699168864 | Pediatrics Physician | Port St Lucie, FL | 2015 |
| Emily Duffy, PT, DPT, CMNT | 1821576679 | Orthopedic Physical Therapist | Allentown, PA | 2018 |
| Emily Duffy | 1841187507 | Speech-Language Pathologist | Portsmouth, RI | 2025 |
| Emily Duffy, APRN, FNP-BC | 1902293723 | Family Nurse Practitioner | Franklin, VA | 2015 |
| Emily Duffy | 1922607423 | Physician Assistant | Denver, CO | 2020 |
| Emily Duffy, LCSW | 1992029268 | Clinical Social Worker | Philadelphia, PA | 2010 |
| Emma Duffy, MA, CCC-SLP | 1659911725 | Speech-Language Pathologist | Boulder, CO | 2020 |
| Emma Duffy | 1699292870 | Student in an Organized Health Care Education/Training Program | Portales, NM | 2017 |
| Emma Duffy, PA-C | 1841158417 | Physician Assistant | Philadelphia, PA | 2026 |
| Emma Duffy | 1992292585 | Counselor | Salem, MA | 2018 |
| Eric Duffy, D.O. | 1376956045 | Surgery Physician | Port St Lucie, FL | 2014 |
| Eric Duffy, M.D. | 1861443327 | Diagnostic Radiology Physician | Hershey, PA | 2006 |
| Erica Duffy, FDN-P, HEALTH COACH | 1457116998 | Health & Wellness Coach | Park Ridge, IL | 2024 |
| Erika Duffy | 1295577435 | Speech-Language Pathologist | Township Of Washington, NJ | 2024 |
| Erika Duffy, LICSW | 1497231070 | School Social Worker | Gloucester, MA | 2018 |
| Erika Duffy, NP | 1700194453 | Primary Care Nurse Practitioner | Billings, MT | 2010 |
| Erin Duffy, OTR/L | 1073039707 | Occupational Therapist | Liverpool, NY | 2017 |
| Erin Duffy, LCSW | 1083263834 | Clinical Social Worker | Naperville, IL | 2019 |
| Erin Duffy, BSN, RN, CCRN | 1477077154 | Registered Nurse | Pittsburgh, PA | 2017 |
| Erin Duffy | 1477233443 | Speech-Language Pathologist | Wyncote, PA | 2023 |
| Erin Duffy, M.D. | 1487647061 | Family Medicine Physician | Willow Grove, PA | 2005 |
| Erin Duffy, MD | 1497215669 | Emergency Medicine Physician | Stony Brook, NY | 2019 |
| Erin Duffy, PA-C | 1518536119 | Physician Assistant | Capitola, CA | 2021 |
| Erin Duffy, OTR L | 1619042280 | Occupational Therapist | Tacoma, WA | 2006 |
| Erin Duffy | 1619822681 | Physical Therapist | West Hartford, CT | 2026 |
| Erin Duffy | 1629558309 | Counselor | Gloucester, MA | 2018 |
| Erin Duffy, PHARM D | 1639441272 | Pharmacist | New York, NY | 2012 |
| Erin Duffy | 1821783291 | Marriage & Family Therapist | San Clemente, CA | 2023 |
| Erin Duffy, M.A., CCC-SLP | 1871701730 | Speech-Language Pathologist | North Canton, OH | 2007 |
| Erin Duffy, MA CF- SLP | 1972050821 | Speech-Language Pathologist | Islip, NY | 2016 |
| Esta Duffy, RBT | 1811674377 | Behavior Technician | Kokomo, IN | 2023 |
| Esther Duffy, MSN, FNP-BC, RN-BC | 1538822630 | Family Nurse Practitioner | Jacksonville, FL | 2021 |
| Eva Duffy, COTA | 1154755973 | Occupational Therapy Assistant | Celina, TX | 2013 |
| Evan Duffy, MD | 1467471011 | Child & Adolescent Psychiatry Physician | Mesa, AZ | 2006 |
| Evelyn Duffy, APRN | 1689615700 | Gerontology Nurse Practitioner | Cleveland, OH | 2006 |
| Faith Duffy, DNP, PMHNP | 1649121187 | Psychiatric/Mental Health Nurse Practitioner | Snellville, GA | 2026 |
| Finnegan Duffy, DDS | 1316783277 | General Practice Dentistry | Minneapolis, MN | 2024 |
| Fiona Duffy | 1578222626 | Behavior Technician | Saint Paul, MN | 2021 |
| Frances Duffy, NP | 1770522450 | Adult Health Nurse Practitioner | Jamaica, NY | 2006 |
| Frances Duffy, LMSW | 1881879252 | Social Worker | Dearborn, MI | 2008 |
| Francis Duffy, MD | 1588865232 | Internal Medicine Physician | Tulsa, OK | 2007 |
| Frank Duffy, RD | 1356643472 | Registered Dietitian | Philadelphia, PA | 2010 |
| Frank Duffy, MD | 1437182508 | Neurology with Special Qualifications in Child Neurology Physician | Boston, MA | 2006 |
| Frederick Duffy, M.D. | 1376546101 | Plastic Surgery Physician | Dallas, TX | 2005 |
| Frieda Duffy, RN | 1336787498 | Psychiatric/Mental Health Clinical Nurse Specialist | Marlborough, MA | 2019 |
| Gabriel Duffy | 1295355337 | Dentist | Indianapolis, IN | 2020 |
| Gail Duffy, LPC | 1245985340 | Addiction (Substance Use Disorder) Counselor | Plymouth Meeting, PA | 2022 |
| Gavan Duffy, M.D. | 1265422182 | Adult Reconstructive Orthopaedic Surgery Physician | Jacksonville, FL | 2005 |
| Gavin Duffy, P.A. | 1316017189 | Physician Assistant | West Reading, PA | 2006 |
| Gerald Duffy | 1861943367 | Medical Physician Assistant | Boston, MA | 2016 |
| Gianna Duffy | 1083275929 | Behavior Technician | Warwick, RI | 2019 |
| Gloria Duffy, MD | 1003806399 | Child & Adolescent Psychiatry Physician | Woodbridge, VA | 2005 |
| Gloria Duffy | 1083758809 | School Registered Nurse | Selbyville, DE | 2007 |
| Gordon Duffy, ATC | 1689163701 | Athletic Trainer | Pensacola, FL | 2018 |
| Grace Duffy, PT, DPT | 1275397838 | Physical Therapist | McKinney, TX | 2024 |
| Grace Duffy | 1588428056 | Registered Dietitian | Sparks Glencoe, MD | 2024 |
| Graycen Duffy, ARNP | 1851839682 | Family Nurse Practitioner | Walla Walla, WA | 2017 |
| Gregory Duffy, GRADUATE INTERN | 1902208168 | Mental Health Counselor | Framingham, MA | 2014 |
| Hanna Duffy, PA-C | 1326912858 | Surgical Physician Assistant | Newark, NJ | 2025 |
| Hannah Duffy, DPT | 1699556472 | Physical Therapist | Portland, ME | 2023 |
| Hannah Duffy | 1942092184 | Counselor | Worcester, MA | 2025 |
| Hannah Duffy | 1942825237 | Behavior Technician | Southborough, MA | 2020 |
| Harriet Duffy, OTR/L | 1013155928 | Occupational Therapist | Little Neck, NY | 2009 |
| Harry Duffy, OTL | 1649574724 | Occupational Therapist | Carmel, NY | 2011 |
| Heather Duffy, D.D.S | 1659686277 | Dentist | Pooler, GA | 2010 |
| Heather Duffy, AAC | 1942995436 | Mental Health Counselor | Centralia, WA | 2023 |
| Helena Duffy, RNP | 1770664195 | Nurse Practitioner | Bronx, NY | 2006 |
| Hilary Duffy, LPC | 1639576291 | Mental Health Counselor | Spring, TX | 2014 |
| Holly Duffy, LMFT | 1518230150 | Marriage & Family Therapist | Santa Barbara, CA | 2012 |
| Hunter Duffy | 1538053921 | Mental Health Counselor | Maplewood, MN | 2025 |
| Ilona Duffy, M.D. | 1053607044 | Pediatrics Physician | Philadelphia, PA | 2011 |
| Ingrid Duffy, NURSE PRACTITIONER | 1376890319 | Family Nurse Practitioner | New Orleans, LA | 2012 |
| Irene Duffy, LCSW | 1356717409 | Clinical Social Worker | Boise, ID | 2015 |
| J Duffy, MD | 1376654285 | Pediatrics Physician | Riverton, UT | 2006 |
| Jacey Duffy, PMHNP-BC | 1346961745 | Psychiatric/Mental Health Nurse Practitioner | Martins Ferry, OH | 2022 |
| Jack Duffy | 1003419003 | Health Educator | Fridley, MN | 2020 |
| Jack Duffy, MA PSYCHOLOGY | 1932300175 | Mental Health Counselor | Bellingham, WA | 2007 |
| Jaclyn Duffy, APRN | 1053725705 | Family Nurse Practitioner | Louisville, KY | 2014 |
| Jacob Duffy | 1861230138 | Behavior Technician | Farmington Hills, MI | 2024 |
| Jacqueline Duffy, AGAC-NP | 1932931532 | Acute Care Nurse Practitioner | Virginia Beach, VA | 2024 |
| Jacquelyn Duffy | 1659854578 | Counselor | Lawrence, MA | 2018 |
| Jaime Duffy | 1275011629 | Behavior Technician | Union, NJ | 2018 |
| Jaime Duffy, APN | 1568281749 | Psychiatric/Mental Health Nurse Practitioner | Normal, IL | 2024 |
| Jake Duffy | 1063346757 | Speech-Language Pathologist | Murrieta, CA | 2026 |
| James Duffy | 1023648805 | Case Manager/Care Coordinator | Keene, NH | 2020 |
| James Duffy, MA, LPCA | 1144152794 | Professional Counselor | Fairfield, CT | 2026 |
| James Duffy, MD | 1174695266 | Internal Medicine Physician | Gaithersburg, MD | 2006 |
| James Duffy, LMHC-LP | 1194687079 | Mental Health Counselor | Holbrook, NY | 2025 |
| James Duffy, MD | 1285375782 | Student in an Organized Health Care Education/Training Program | Louisville, KY | 2022 |
| James Duffy | 1700443017 | Pharmacist | Greenwich, CT | 2019 |
| James Duffy, MD | 1720299027 | Anesthesiology Physician | Cincinnati, OH | 2007 |
| James Duffy, LCADC | 1750938783 | Addiction (Substance Use Disorder) Counselor | Lusby, MD | 2019 |
| James Duffy, RPH | 1801196324 | Pharmacist | Cheney, WA | 2010 |
| James Duffy, M.D. | 1821098294 | Sports Medicine (Orthopaedic Surgery) Physician | Cincinnati, OH | 2005 |
| James Duffy, MD | 1831118736 | Psychiatry Physician | Mystic, CT | 2006 |
| James Duffy, D.C. | 1861522955 | Neurology Chiropractor | Marietta, GA | 2007 |
| James Duffy, MA | 1912919127 | Mental Health Counselor | Nashua, NH | 2006 |
| Jamie Duffy | 1114568805 | Social Worker | Newark, NJ | 2019 |
| Jamie Duffy, MS, OTR-L | 1265658868 | Contractor | Melville, NY | 2007 |
| Jamie Duffy, ARNP | 1356981518 | Nurse Practitioner | Coralville, IA | 2020 |
| Jamira Duffy, M.D. | 1962614552 | Family Medicine Physician | Murfreesboro, TN | 2007 |
| Jane Duffy, LAC | 1316618028 | Addiction (Substance Use Disorder) Counselor | Missoula, MT | 2021 |
| Jane Duffy, OTR | 1801972112 | Occupational Therapist | Perkinsville, VT | 2006 |
| Janet Duffy, LMHC, LPC | 1760881692 | Mental Health Counselor | New York, NY | 2014 |
| Janette Duffy | 1497627517 | Behavior Technician | Spring Valley, CA | 2025 |
| Janice Duffy, CRNA | 1487697330 | Certified Registered Nurse Anesthetist | Falls Church, VA | 2006 |
| Janna Duffy, OTR/L | 1225448566 | Occupational Therapist | North Bethesda, MD | 2014 |
| Jared Duffy | 1326790957 | Clinical Social Worker | Pittsburgh, PA | 2022 |
| Jasmin Duffy | 1275118903 | Counselor | Hagerstown, MD | 2021 |
| Jason Duffy, PHD, M.S., NCC, ACS | 1841656048 | Mental Health Counselor | Rochester, NY | 2016 |
| Jay Duffy | 1538310370 | Counselor | Honolulu, HI | 2008 |
| Jean Duffy, D. C. | 1710050190 | Chiropractor | Thousand Oaks, CA | 2006 |
| Jeanette Duffy, DOM | 1740659770 | Acupuncturist | Albuquerque, NM | 2015 |
| Jeanie Duffy | 1417229915 | Rehabilitation Practitioner | Las Vegas, NV | 2012 |
| Jeanine Duffy | 1295985604 | Clinical Social Worker | Somerville, MA | 2008 |
| Jeanne Duffy, PHD | 1396048153 | Sleep Specialist (PhD) | Boston, MA | 2010 |
| Jeffrey Duffy | 1457951196 | Pharmacist | Steubenville, OH | 2020 |
| Jeffrey Duffy, D.D.S. | 1881006021 | General Practice Dentistry | Advance, NC | 2014 |
| Jene Duffy, BSN, AS, RN, MCC | 1326792714 | Community Health Registered Nurse | Milton, DE | 2022 |
| Jennie Duffy, MD | 1851395800 | Dermatology Physician | Houston, TX | 2005 |
| Jennifer Duffy, FNP | 1013687011 | Family Nurse Practitioner | Albuquerque, NM | 2021 |
| Jennifer Duffy | 1164229050 | Massage Therapist | Winthrop, ME | 2025 |
| Jennifer Duffy, L.M.T. | 1225397078 | Massage Therapist | Poughkeepsie, NY | 2012 |
| Jennifer Duffy | 1255940755 | Behavior Analyst | Woodland Hills, CA | 2020 |
| Jennifer Duffy, DPT | 1306727649 | Physical Therapist | Northfield, OH | 2025 |
| Jennifer Duffy, LCSW | 1346554953 | Clinical Social Worker | San Antonio, TX | 2010 |
| Jennifer Duffy, ED.S. | 1427977842 | School Psychologist | Chandler, AZ | 2026 |
| Jennifer Duffy, APN-CNP | 1649557927 | Nurse Practitioner | Elmhurst, IL | 2011 |
| Jennifer Duffy | 1780533695 | Behavior Technician | Leander, TX | 2026 |
| Jennifer Duffy | 1811192909 | Rehabilitation Counselor | Dubuque, IA | 2007 |
| Jennifer Duffy, MS,MHR,PLMHP | 1821244252 | Mental Health Counselor | Omaha, NE | 2008 |
| Jennifer Duffy, MD | 1841631801 | Maternal & Fetal Medicine Physician | Burlingame, CA | 2013 |
| Jennifer Duffy, PHD | 1881716470 | Specialist | Corte Madera, CA | 2007 |
| Jennifer Duffy | 1891437273 | Student in an Organized Health Care Education/Training Program | Farmington, CT | 2022 |
| Jennifer Duffy, PH. D. | 1952814816 | Clinical Psychologist | Centerport, NY | 2017 |
| Jessica Duffy, DNP, APRN, AGACNP-BC | 1033726757 | Nurse Practitioner | Louisville, KY | 2020 |
| Jessica Duffy | 1053063818 | Addiction (Substance Use Disorder) Counselor | Xenia, OH | 2022 |
| Jessica Duffy | 1447767876 | Clinical Social Worker | Danbury, CT | 2018 |
| Jessica Duffy, OTR/L | 1609153295 | Occupational Therapist | Wantagh, NY | 2011 |
| Jessica Duffy, OTR | 1659356418 | Occupational Therapist | Indianapolis, IN | 2005 |
| Jessica Duffy, PSYD | 1881083830 | Clinical Psychologist | Portsmouth, NH | 2015 |
| Jill Duffy, LCSW | 1215514708 | Clinical Social Worker | Gastonia, NC | 2021 |
| Jill Duffy, ARNP | 1396186581 | Adult Health Nurse Practitioner | Des Moines, IA | 2013 |
| Jill Duffy, P.A. | 1619128626 | Physician Assistant | Durham, NC | 2008 |
| Jillian Duffy, MD | 1942705884 | Emergency Medicine Physician | Boston, MA | 2018 |
| Jo Ann Duffy, RRT | 1205992575 | Registered Respiratory Therapist | Berkeley Heights, NJ | 2006 |
| Joan Duffy, PHYSICAL THERAPIST | 1114263480 | Physical Therapist | Portsmouth, NH | 2012 |
| Joan Duffy, MD | 1235206186 | Geriatric Medicine (Family Medicine) Physician | Bellflower, CA | 2006 |
| Joann Duffy, RN | 1982360970 | Registered Nurse | Methuen, MA | 2021 |
| Joanna Duffy, CD(DONA),CLC,CPST | 1639904253 | Doula | Moline, IL | 2024 |
| Joanne Duffy, APN | 1023397437 | Acute Care Clinical Nurse Specialist | Wayne, NJ | 2011 |
| Joanne Duffy, PH.D | 1124172226 | Psychologist | Baltimore, MD | 2007 |
| Jocelyn Duffy, MD | 1932123338 | Family Medicine Physician | Andover, MA | 2006 |
| Jocelyn Duffy, M.S., CCC-SLP | 1942408273 | Speech-Language Pathologist | Kansas City, MO | 2007 |
| Jodi Duffy, LMT | 1023599537 | Massage Therapist | North Babylon, NY | 2018 |
| John Duffy, LMBT#2912 | 1023974060 | Massage Therapist | Clayton, NC | 2026 |
| John Duffy, PH.D. | 1083732564 | Clinical Psychologist | Pittsburgh, PA | 2007 |
| John Duffy, O.D. | 1184769713 | Optometrist | Rosemont, PA | 2007 |
| John Duffy, DPT | 1235936253 | Physical Therapist | Statesville, NC | 2025 |
| John Duffy | 1255250338 | Registered Nurse | Chicago, IL | 2026 |
| John Duffy, MD | 1255497251 | Psychiatry Physician | Santa Ana, CA | 2006 |
| John Duffy, MD | 1295710358 | Family Medicine Physician | Canton, NY | 2005 |
| John Duffy, CCP | 1295947059 | Perfusionist | Phoenix, AZ | 2007 |
| John Duffy, OT/L, CHT | 1376203638 | Occupational Therapist | Hollywood, FL | 2021 |
| John Duffy | 1437204708 | Pharmacist | New York, NY | 2007 |
| John Duffy, PH.D. | 1457325144 | Clinical Psychologist | Pensacola, FL | 2006 |
| John Duffy | 1457822389 | Mental Health Counselor | Whitinsville, MA | 2018 |
| John Duffy, PSYD | 1467023242 | Clinical Psychologist | La Grange, IL | 2021 |
| John Duffy, PA-C | 1548331531 | Physician Assistant | Pittsburgh, PA | 2006 |
| John Duffy, MD | 1548368111 | Transplant Surgery Physician | Oklahoma City, OK | 2006 |
| John Duffy, MD | 1568519437 | Urology Physician | Tuscaloosa, AL | 2007 |
| John Duffy | 1588130918 | Social Worker | Sacaton, AZ | 2018 |
| John Duffy, PT | 1679557235 | Physical Therapist | Pittsburgh, PA | 2005 |
| John Duffy, D.D.S. | 1679696801 | General Practice Dentistry | Fresh Meadows, NY | 2007 |
| John Duffy | 1750654844 | Pharmacist | Emerson, NJ | 2012 |
| John Duffy, DMD | 1821420324 | Dentist | Salem, OR | 2013 |
| John Duffy, MD | 1861997025 | Pediatric Sports Medicine Physician | Philadelphia, PA | 2018 |
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).