Providers Maelynn Niehaus, OD to Aubrey Nielsen, APRN
300 individual NPIs in the federal registry, part 15,819 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. 102 link to a page of their own with Medicare and CMS data the registry does not carry.
| Provider | NPI | Specialty | Practice city | NPI issued |
|---|---|---|---|---|
| Maelynn Niehaus, OD | 1982088233 | Optometrist | Philadelphia, PA | 2015 |
| Makayla Niehaus | 1831716596 | Pharmacist | Sac City, IA | 2020 |
| Maria Niehaus, PT, DPT | 1083595466 | Physical Therapist | Phoenix, AZ | 2025 |
| Mark Niehaus, MD | 1972541548 | Internal Medicine Physician | Charlottesville, VA | 2006 |
| Mary Niehaus | 1972896538 | Community Health Worker | Topeka, KS | 2011 |
| Matthew Niehaus, AA-C | 1679912216 | Anesthesiologist Assistant | Greenwood Village, CO | 2013 |
| Matthew Niehaus, DO | 1952745077 | Emergency Medicine Physician | Bethlehem, PA | 2013 |
| Michael Niehaus, LPC | 1003806662 | Mental Health Counselor | Valley Park, MO | 2005 |
| Michael Niehaus, MD | 1992764096 | Surgery Physician | West Burlington, IA | 2006 |
| Michelle Niehaus, LCSW | 1225142425 | Social Worker | Louisville, KY | 2006 |
| Michelle Niehaus | 1629530399 | Nurse Practitioner | Quincy, IL | 2019 |
| Nicole Niehaus | 1447863220 | Behavior Analyst | Cosmos, MN | 2020 |
| Peg Niehaus, P.C. | 1598947954 | Professional Counselor | Cincinnati, OH | 2007 |
| Perinjit Niehaus, PA-C | 1093170557 | Surgical Physician Assistant | Bloomington, IN | 2015 |
| Rebecca Niehaus, LISW | 1174794549 | Clinical Social Worker | Clive, IA | 2008 |
| Regan Niehaus, CSS | 1205411147 | Community Health Worker | Omaha, NE | 2021 |
| Robin Niehaus | 1356649537 | Chiropractor | Decatur, IL | 2011 |
| Ryan Niehaus, D.O. | 1235396045 | Sports Medicine (Family Medicine) Physician | Bloomington, IN | 2008 |
| Saleena Niehaus, D.P.M. | 1053717181 | Foot & Ankle Surgery Podiatrist | Tampa, FL | 2014 |
| Sarah Niehaus, MD | 1790536787 | Family Medicine Physician | Santa Rosa, CA | 2024 |
| Teresa Niehaus, OTR | 1972794725 | Occupational Therapist | Vincennes, IN | 2007 |
| Theodore Niehaus | 1679395610 | Addiction (Substance Use Disorder) Counselor | Cincinnati, OH | 2024 |
| Timothy Niehaus, CNIM | 1528696119 | Technician/Technologist | Chicago, IL | 2020 |
| Tonya Niehaus, LMSW | 1619747409 | Clinical Social Worker | Cedar Rapids, IA | 2024 |
| Valeria Niehaus, P.T. | 1184000226 | Geriatric Physical Therapist | Charlottesville, VA | 2015 |
| William Niehaus | 1144328774 | Clinical Social Worker | Greenwood, IN | 2006 |
| William Niehaus, MD | 1346539517 | Physical Medicine & Rehabilitation Physician | Aurora, CO | 2011 |
| Gabriela Niehauser, PT | 1477110708 | Physical Therapist | Cincinnati, OH | 2019 |
| Gregory Niehauser, D.O. | 1518908250 | Family Medicine Physician | Cincinnati, OH | 2006 |
| Megan Niehauser, LPCC | 1659866622 | Mental Health Counselor | Cincinnati, OH | 2018 |
| Lindsey Niehay, M.D. | 1972981389 | Student in an Organized Health Care Education/Training Program | El Paso, TX | 2015 |
| Charlena Niehenke | 1588296107 | Behavior Technician | Dupont, WA | 2020 |
| Katie Niehl, AU.D. | 1124337886 | Audiologist | Tacoma, WA | 2010 |
| Beverly Niehls, MD | 1215934666 | Family Medicine Physician | Reading, PA | 2005 |
| Sandy Niehm, FNP | 1215979430 | Family Nurse Practitioner | Vancouver, WA | 2006 |
| Abby Niehoff | 1407294036 | Case Manager/Care Coordinator | Carson City, NV | 2013 |
| Alice Niehoff, DT | 1558845008 | Developmental Therapist | Georgetown, IN | 2018 |
| Ana Niehoff, DDS | 1508023557 | General Practice Dentistry | Manhattan Beach, CA | 2008 |
| Andrea Niehoff, CMA | 1881363265 | Other Specialist/Technologist | Spokane, WA | 2021 |
| Billie Niehoff, RN | 1740710102 | Occupational Health Registered Nurse | Fort Stewart, GA | 2017 |
| Brianna Niehoff, OD | 1154981850 | Optometrist | Connersville, IN | 2019 |
| Claire Niehoff, RD, LD | 1194079038 | Registered Dietitian | Saint Louis, MO | 2012 |
| Cora Niehoff | 1699460980 | Personal Care Attendant | Camden, OH | 2023 |
| Elizabeth Niehoff, MD | 1942002803 | Student in an Organized Health Care Education/Training Program | Kingwood, TX | 2025 |
| Erin Niehoff, O.D. | 1790913614 | Optometrist | Troy, MO | 2009 |
| Jennifer Niehoff | 1043862196 | Ambulatory Care Pharmacist | Noblesville, IN | 2019 |
| Jessica Niehoff, R.N., A.N.P | 1467490870 | Adult Health Nurse Practitioner | Troy, MO | 2006 |
| Joan Niehoff, MD | 1619995313 | Pediatric Anesthesiology Physician | Saint Louis, MO | 2006 |
| Jodi Niehoff, MA, CCC-SLP | 1497300586 | Speech-Language Pathologist | Hannibal, MO | 2019 |
| John Niehoff | 1447229349 | Family Medicine Physician | Baltimore, MD | 2006 |
| Kevin Niehoff, PHARMD | 1194114488 | Pharmacist | Aventura, FL | 2015 |
| Kristina Niehoff, PHARMD | 1427308212 | Pharmacist | West Haven, CT | 2012 |
| Laura Niehoff, M.S., R.D., L.D. | 1558662569 | Registered Dietitian | Ballwin, MO | 2010 |
| Laura Niehoff, CRNA | 1598908592 | Certified Registered Nurse Anesthetist | Saint Louis, MO | 2009 |
| Lauren Niehoff, PHARMD | 1881083145 | Pharmacist | Kenosha, WI | 2015 |
| Loren Niehoff, LMFT | 1912344466 | Marriage & Family Therapist | Alexandria, MN | 2013 |
| Mickey Niehoff, D.C. | 1053563734 | Chiropractor | Brandon, FL | 2008 |
| Natalie Niehoff, DNP, FNP-C | 1255225207 | Family Nurse Practitioner | Saint Louis, MO | 2025 |
| Olivia Niehoff, OTR | 1073009221 | Occupational Therapist | Prospect, KY | 2018 |
| Robert Niehoff, LMFT | 1063996080 | Marriage & Family Therapist | Brooklyn Park, MN | 2018 |
| Sara Niehoff | 1518881127 | Speech-Language Pathologist | Washington, IN | 2026 |
| Sarah Niehoff | 1043540024 | Behavior Analyst | Oak Park, IL | 2010 |
| Suzanna Niehoff, MS,RD,LD | 1659721223 | Registered Dietitian | Gainesville, FL | 2016 |
| Patricia Niehoo, P.T. | 1033423777 | Physical Therapist | Pacific, MO | 2010 |
| Leo Niehorster-Cook | 1578223616 | Behavior Technician | San Diego, CA | 2021 |
| Aline Niehues, CNP | 1225405392 | Family Nurse Practitioner | St Paul, MN | 2015 |
| Anita Niehues, M.S.,OTR | 1851431514 | Specialist | Sycamore, IL | 2007 |
| Ashley Niehues | 1003775271 | Health & Wellness Coach | Orland, CA | 2026 |
| Caleb Niehues, DO | 1700535077 | Emergency Medicine Physician | Tulsa, OK | 2022 |
| Christopher Niehues, DO | 1518453448 | Obstetrics & Gynecology Physician | Great Falls, MT | 2018 |
| Christy Niehues, P.A. | 1063733798 | Physician Assistant | Yukon, OK | 2010 |
| Denise Niehues, PA | 1508152687 | Physician Assistant | Hickory, NC | 2011 |
| Emily Niehues, MSN, APRN, FNP-BC | 1457122194 | Family Nurse Practitioner | San Angelo, TX | 2024 |
| Logan Niehues, MD | 1205330776 | Emergency Medicine Physician | Temple, TX | 2018 |
| Michelle Niehues | 1730552001 | Marriage & Family Therapist | Topeka, KS | 2015 |
| Rochelle Niehues, LICSW | 1366969784 | Clinical Social Worker | Duluth, MN | 2017 |
| Sherry Niehues | 1134062029 | Speech-Language Pathologist | Cary, NC | 2026 |
| Stacey Niehues, OD | 1154851483 | Optometrist | Holton, KS | 2017 |
| Stacie Niehues | 1639719016 | Pharmacist Clinician (PhC)/ Clinical Pharmacy Specialist | Topeka, KS | 2020 |
| Douglas Niehus, MD | 1144250085 | Family Medicine Physician | Tigard, OR | 2006 |
| Hollee Niehus, PHARMD | 1386520518 | Pharmacist Clinician (PhC)/ Clinical Pharmacy Specialist | Watertown, SD | 2025 |
| Hunter Niehus | 1477130839 | Student in an Organized Health Care Education/Training Program | Portland, OR | 2021 |
| Janna Niehus, MA | 1659012342 | Mental Health Counselor | Bozeman, MT | 2022 |
| Jessica Niehus | 1992681084 | Behavior Technician | West Chicago, IL | 2025 |
| Joe Niehus, MD | 1043297260 | Diagnostic Radiology Physician | Denison, TX | 2005 |
| Karlie Niehus | 1750079174 | Professional Counselor | Sherman, TX | 2023 |
| Katie Niehus, PSYD | 1518738657 | Clinical Psychologist | Dallas, TX | 2024 |
| Maci Niehus | 1124982491 | Day Training/Habilitation Specialist | Wayne, NE | 2025 |
| Melanie Niehus, RPH | 1184995805 | Pharmacist | Chattahoochee, FL | 2012 |
| Ryan Niehus, PSYD | 1992098636 | Clinical Psychologist | Bozeman, MT | 2011 |
| Alisa Niehuser | 1023253705 | Clinical Psychologist | Jber, AK | 2008 |
| Jenny Niehuser | 1841000825 | Behavior Technician | Palo Alto, CA | 2025 |
| Lisa Niehuser | 1629815063 | Behavior Technician | Palo Alto, CA | 2024 |
| Jennifer Niehuss | 1881275246 | Family Nurse Practitioner | Gulf Shores, AL | 2021 |
| Michael Niehuss, MSN, CRNP, NP-C | 1093480113 | Family Nurse Practitioner | Mobile, AL | 2021 |
| Herbert Niehuus, CO.BOCP. | 1578062840 | Prosthetist | Honolulu, HI | 2018 |
| Rachel Niehuus, MD, PHD | 1326402496 | Trauma Surgery Physician | Chapel Hill, NC | 2016 |
| Julia Nieid, HYGIENIST | 1750004172 | Dental Hygienist | Torrington, CT | 2022 |
| Daniel Niejadlik, M.D. | 1588693220 | Anatomic Pathology & Clinical Pathology Physician | Middletown, CT | 2006 |
| Emily Niejadlik, BA | 1467762674 | Counselor | Framingham, MA | 2010 |
| Kenneth Niejadlik | 1033285390 | Anesthesiology Physician | Duluth, MN | 2006 |
| Michael Niejadlik, MS, RD, LDN, CSCS | 1235755653 | Registered Dietitian | Worcester, MA | 2020 |
| Jessica Niek, LADC | 1487257416 | Addiction (Substance Use Disorder) Counselor | Kent, CT | 2020 |
| Andrew Niekamp, MD | 1437576626 | Vascular & Interventional Radiology Physician | Urbana, IL | 2014 |
| Casey Niekamp | 1508396375 | Dentist | Wentzville, MO | 2017 |
| Cheyenne Niekamp, RN | 1497515936 | Registered Nurse | Mount Sterling, OH | 2024 |
| David Niekamp, D.C., NP-C | 1114117132 | Nurse Practitioner | Houston, TX | 2007 |
| David Niekamp, PSY.D. | 1972656940 | Clinical Psychologist | Geneva, IL | 2007 |
| Erin Niekamp, D.C. | 1629219183 | Chiropractor | St Henry, OH | 2009 |
| Hayden Niekamp, DPT | 1851964126 | Physical Therapist | Wasilla, AK | 2021 |
| Janel Niekamp, SLP | 1376957746 | Speech-Language Pathologist | Columbus, OH | 2014 |
| Julie Niekamp, L.AC. | 1770368631 | Acupuncturist | Baldwin, WI | 2023 |
| Kendra Niekamp | 1356733448 | School Psychologist | Wapakoneta, OH | 2015 |
| Kendra Niekamp | 1720080633 | Pharmacist | St Marys, OH | 2005 |
| Lora Niekamp | 1982290862 | Home Health Aide | Dayton, OH | 2020 |
| Rebecca Niekamp, RD, LD | 1366714578 | Registered Dietitian | Wapakoneta, OH | 2012 |
| Rylee Niekamp | 1679353502 | Physical Therapy Assistant | Osage Beach, MO | 2023 |
| Samantha Niekamp, M.D. | 1942627138 | Anesthesiology Physician | Miami, FL | 2014 |
| Sherry Niekamp | 1770153991 | Occupational Therapy Assistant | Cape Coral, FL | 2021 |
| Karen Nieke | 1851554109 | Social Worker | Liberty, NY | 2008 |
| Kati Niekerk, LMSW | 1356844591 | Clinical Social Worker | Belleville, WI | 2018 |
| Kristin Niekerk, MS LPC | 1588966246 | Professional Counselor | Tomball, TX | 2010 |
| Cordelia Nieketien-Tawari, DNP, APRN-BC. LNP | 1194827139 | Family Nurse Practitioner | Reston, VA | 2006 |
| Jessica Niekowal, M.A. | 1720437825 | Professional Counselor | Jackson, MI | 2016 |
| Joshua Niekranz, PMHNP-BC | 1396407227 | Psychiatric/Mental Health Nurse Practitioner | Reston, VA | 2021 |
| Regina Niekrash, D.M.D. | 1356586234 | General Practice Dentistry | New Haven, CT | 2008 |
| Mark Niekrasz, D.D.S. | 1801090238 | General Practice Dentistry | Palatine, IL | 2007 |
| Dennis Niekro, NP | 1114207347 | Nurse Practitioner | Monterey, CA | 2011 |
| Emilee Niekro, CRNA | 1053478941 | Certified Registered Nurse Anesthetist | Lakeland, FL | 2007 |
| Alexis Niel | 1982450581 | Personal Care Attendant | Reno, NV | 2024 |
| Brenda Niel, LPC | 1144372335 | Professional Counselor | Chattanooga, TN | 2007 |
| Heather Niel, MA, LCPC | 1073817029 | Mental Health Counselor | Sparks, NV | 2011 |
| Jean-Luc Niel, DMD | 1437312881 | Oral and Maxillofacial Surgery (Dentist) | Ellicott City, MD | 2008 |
| Katelyn Niel, B.A.. | 1821347063 | Mental Health Counselor | Sacramento, CA | 2012 |
| Katherine Niel, DO | 1063272664 | Diagnostic Radiology Physician | Mobile, AL | 2024 |
| Katherine Niel | 1609595735 | Behavior Technician | Monrovia, CA | 2022 |
| Kristin Niel, PH.D. | 1346727963 | Clinical Child & Adolescent Psychologist | Memphis, TN | 2018 |
| Gary Nielan | 1568458479 | Pediatric Adolescent Medicine Physician | Wilbraham, MA | 2005 |
| Alexandra Nieland, RBT | 1013676469 | Behavior Technician | Farmington Hills, MI | 2021 |
| Branden Nieland | 1114543303 | Physical Therapy Assistant | The Woodlands, TX | 2020 |
| Eric Nieland | 1912636200 | Optician | Lexington, KY | 2022 |
| Erin Nieland, PT | 1447564729 | Physical Therapist | Jamestown, ND | 2010 |
| Hannah Nieland, CCC-SLP | 1679098669 | Speech-Language Pathologist | Saint Louis, MO | 2017 |
| Hollie Nieland, FNP-BC | 1962038968 | Family Nurse Practitioner | New Lenox, IL | 2020 |
| James Nieland, D.C. | 1912098062 | Chiropractor | Wilkesboro, NC | 2006 |
| John Nieland | 1154947976 | Occupational Therapist | Florissant, MO | 2020 |
| Karlyn Nieland | 1285040410 | Nurse Practitioner | Portland, OR | 2014 |
| Kasey Nieland, OTR/L | 1134723687 | Occupational Therapist | Salt Lake City, UT | 2020 |
| Kellyn Nieland | 1972997062 | Certified Registered Nurse Anesthetist | Omaha, NE | 2015 |
| Kristi Nieland, RRT | 1669671954 | Registered Respiratory Therapist | Hillsboro, OR | 2007 |
| Kristin Nieland | 1649194440 | Student in an Organized Health Care Education/Training Program | Diana, TX | 2026 |
| Kyle Nieland, OD | 1922839828 | Optometrist | Appleton, WI | 2024 |
| Makenzie Nieland | 1043945868 | Case Manager/Care Coordinator | Seattle, WA | 2022 |
| Matthew Nieland | 1811705106 | Student in an Organized Health Care Education/Training Program | South Bend, IN | 2024 |
| Melissa Nieland, M.D. | 1730384405 | Family Medicine Physician | Belton, TX | 2007 |
| Michelle Nieland, PHARMD | 1205752854 | Pediatric Pharmacist | Indianapolis, IN | 2026 |
| Natalie Nieland | 1699418657 | Behavior Technician | Bakersfield, CA | 2022 |
| Robert Nieland, DO | 1245724079 | Family Medicine Physician | Hendersonville, NC | 2018 |
| Samantha Nieland | 1770435273 | Family Nurse Practitioner | Cedar Rapids, IA | 2026 |
| Tina Nieland, LPN | 1700092368 | Licensed Practical Nurse | Tama, IA | 2007 |
| Ricardo Nieland Zavala | 1063014355 | Behavior Technician | Farmington Hills, MI | 2020 |
| Adam Nielander | 1457153801 | Behavior Technician | Northfield, IL | 2025 |
| Carole Nielander | 1437806148 | Personal Care Attendant | Princeton, WV | 2022 |
| Gabriel Nielander | 1437960952 | Behavior Technician | Kokomo, IN | 2025 |
| Jason Nielander, LPN | 1700056389 | Licensed Practical Nurse | Plymouth Meeting, PA | 2008 |
| Krystal Nielander | 1912717646 | Assistant Behavior Analyst | Brooklyn, NY | 2025 |
| James Nielcen, R.PH. | 1427199504 | Pharmacist | Waverly, IA | 2007 |
| Amy Nield | 1871221408 | Physician Assistant | Pocatello, ID | 2022 |
| Andrew Nield, D.D.S | 1841250990 | General Practice Dentistry | Syracuse, UT | 2006 |
| Angalena Nield | 1487229902 | Behavior Technician | Killeen, TX | 2021 |
| Christopher Nield, O.D. | 1881792695 | Optometrist | Fort Hall, ID | 2006 |
| Donald Nield, D.M.D. | 1699797597 | General Practice Dentistry | San Antonio, TX | 2006 |
| Donna Nield, L. AC. | 1104294735 | Acupuncturist | New York, NY | 2015 |
| Emily Nield | 1649105958 | Occupational Therapist | Mount Pleasant, PA | 2026 |
| Janice Nield | 1013072602 | Case Management Registered Nurse | Hot Springs, AR | 2006 |
| Janoy Nield, LCSW | 1407995194 | Clinical Social Worker | St George, UT | 2007 |
| Kyle Nield, DDS | 1295221877 | General Practice Dentistry | Laurens, SC | 2018 |
| Linda Nield, M.D. | 1316027238 | Pediatrics Physician | Morgantown, WV | 2006 |
| Lisa Nield | 1063683118 | Occupational Therapist | Salt Lake City, UT | 2008 |
| Nick Nield | 1952924169 | Diagnostic Neuroimaging (Radiology) Physician | St George, UT | 2020 |
| Robert Nield, MSW LCSW LICSW | 1326143991 | Clinical Social Worker | Brattleboro, VT | 2006 |
| Sofia Nield | 1871465393 | Massage Therapist | Hagerstown, MD | 2025 |
| Sunnie Nield, FNP-C | 1649090374 | Family Nurse Practitioner | Salt Lake City, UT | 2024 |
| Leslie Nield Anderson, ARNP; PHD | 1831140920 | Psychiatric/Mental Health Registered Nurse | Sun City Center, FL | 2006 |
| Danielle Nields, DPT | 1790121366 | Physical Therapist | Downingtown, PA | 2013 |
| Elizabeth Nields, MD | 1710544614 | Pediatrics Physician | Florence, KY | 2019 |
| Emily Nields, DO | 1144457656 | Family Medicine Physician | Exeter, NH | 2009 |
| Henry Nields, MD, PHD | 1992899975 | Forensic Pathology Physician | Boston, MA | 2006 |
| Jenifer Nields, M.D. | 1336278043 | Psychiatry Physician | Fairfield, CT | 2007 |
| William Nields, M.D. | 1972587848 | General Practice Physician | Jacksonville, FL | 2005 |
| Tom Nields-Duffy, MA | 1023165131 | Mental Health Counselor | Northampton, MA | 2007 |
| Christine Nielepko, LMFT | 1518796739 | Marriage & Family Therapist | San Jose, CA | 2024 |
| Amanda Nieliwocki, LCSW | 1619463445 | Clinical Social Worker | Long Branch, NJ | 2018 |
| Bethany Niell, MD | 1720114457 | Diagnostic Radiology Physician | Tampa, FL | 2007 |
| Heidi Niell, PAC | 1093745317 | Physician Assistant | Boston, MA | 2006 |
| Judy Niell, PA-C | 1295865533 | Physician Assistant | Lindale, TX | 2007 |
| Jose Niell-Manent, M.D. | 1235220872 | Gastroenterology Physician | Stamford, CT | 2006 |
| Mariana Niell-Swiller, MS, CGC | 1518271824 | Genetic Counselor (M.S.) | Poughkeepsie, NY | 2010 |
| Alexander Niella | 1427824374 | Electroneurodiagnostic Specialist/Technologist | Brentwood, TN | 2023 |
| Kentaya Nielly, MS, LMHC | 1154942688 | Mental Health Counselor | West Park, FL | 2020 |
| Kristi Len Nielo | 1538669817 | Family Nurse Practitioner | Katy, TX | 2018 |
| Alexander Niels | 1609648070 | Behavior Technician | Las Cruces, NM | 2023 |
| Bruce Niels, LPT | 1861857419 | Licensed Psychiatric Technician | Norwalk, CA | 2015 |
| Shane Niels, CADC-1 | 1437965621 | Mental Health Counselor | Los Angeles, CA | 2024 |
| A Nielsen, MD | 1063430122 | Family Medicine Physician | Grand Forks, ND | 2006 |
| Aaron Nielsen, L.M.P. | 1548600133 | Massage Therapist | Kirkland, WA | 2013 |
| Aaron Nielsen, D.C. | 1821296955 | Chiropractor | Omaha, NE | 2007 |
| Adam Nielsen, PHARM D | 1720421605 | Pharmacist Clinician (PhC)/ Clinical Pharmacy Specialist | Columbia, TN | 2013 |
| Addisen Nielsen | 1366204729 | Behavior Technician | Omaha, NE | 2024 |
| Adelina Nielsen | 1255000352 | Community Health Worker | Cedar City, UT | 2021 |
| Adrienne Nielsen | 1124662424 | Behavior Technician | Cottonwood Heights, UT | 2019 |
| Ailene Nielsen, APRNC | 1770542839 | Nurse Practitioner | Omaha, NE | 2006 |
| Ailsa Nielsen, LCPC | 1952539959 | Professional Counselor | Chicago, IL | 2009 |
| Aimee Nielsen, LCSW | 1023290137 | Clinical Social Worker | Fishers, IN | 2007 |
| Albert Nielsen, M.D. | 1992808976 | Family Medicine Physician | Gridley, CA | 2006 |
| Alecia Nielsen | 1669912077 | Social Worker | McHenry, IL | 2017 |
| Alex Nielsen, LMHP, BCBA | 1447873526 | Behavior Analyst | Omaha, NE | 2020 |
| Alexander Nielsen, MD | 1285194332 | Orthopaedic Surgery Physician | Salt Lake City, UT | 2019 |
| Alexandra Nielsen | 1104702828 | Behavior Technician | Las Vegas, NV | 2025 |
| Alexandra Nielsen, PA | 1285185520 | Physician Assistant | Brooklyn, NY | 2016 |
| Alexandra Nielsen, RN, NP | 1588124838 | Nurse Practitioner | Boise, ID | 2019 |
| Alexandrea Nielsen, LLMSW | 1821736315 | Clinical Social Worker | Grand Rapids, MI | 2022 |
| Alexis Nielsen, LMFT | 1487121695 | Marriage & Family Therapist | Las Vegas, NV | 2018 |
| Alice Nielsen | 1750724076 | Case Manager/Care Coordinator | Provo, UT | 2013 |
| Alicia Nielsen, PA-C | 1568630887 | Physician Assistant | Charlotte, NC | 2008 |
| Alison Nielsen, MD | 1265536213 | Anesthesiology Physician | Mather, CA | 2006 |
| Alison Nielsen, M.S. CCC/SLP | 1528998580 | Speech-Language Pathologist | Lomira, WI | 2026 |
| Alissa Nielsen, PHARM.D | 1467401547 | Pharmacist | Orem, UT | 2006 |
| Allen Nielsen, MD | 1780721068 | Neurology Physician | Seattle, WA | 2007 |
| Allie Nielsen | 1033845649 | Community Health Worker | St George, UT | 2022 |
| Allison Nielsen, MS | 1578404083 | Obstetrics & Gynecology Physician | Saginaw, MI | 2026 |
| Allison Nielsen | 1780541599 | Registered Nurse | Omaha, NE | 2026 |
| Alyson Nielsen | 1689349433 | Registered Dietitian | Boise, ID | 2021 |
| Alyssa Nielsen, MD | 1417659780 | Student in an Organized Health Care Education/Training Program | New Haven, CT | 2023 |
| Alyssa Nielsen | 1568757128 | Pharmacist | Edina, MN | 2011 |
| Alyssa Nielsen, MA CCC-SLP | 1932873379 | Speech-Language Pathologist | Upper Chichester, PA | 2021 |
| Amanda Nielsen, LCSW | 1003182049 | Clinical Social Worker | Reno, NV | 2012 |
| Amanda Nielsen | 1093103665 | Pediatric Occupational Therapist | Franklin, TN | 2015 |
| Amanda Nielsen | 1144035940 | Nurse's Aide | Hastings, NE | 2025 |
| Amanda Nielsen | 1275900888 | Social Worker | Caldwell, ID | 2015 |
| Amanda Nielsen, AU.D. | 1295277622 | Audiologist | Vancouver, WA | 2016 |
| Amanda Nielsen, ARNP | 1376166769 | Gerontology Nurse Practitioner | Seattle, WA | 2020 |
| Amanda Nielsen | 1376250522 | Counselor | Luzerne, PA | 2022 |
| Amanda Nielsen, M.A. CCC-SLP | 1487064010 | Speech-Language Pathologist | Roaring River, NC | 2014 |
| Amanda Nielsen, DPT | 1528355765 | Physical Therapist | Seattle, WA | 2011 |
| Amanda Nielsen, LCSW | 1598426090 | Clinical Social Worker | Niceville, FL | 2022 |
| Amanda Nielsen, OTR/L | 1730733866 | Occupational Therapist | Elko, NV | 2019 |
| Amanda Nielsen | 1851420301 | Case Manager/Care Coordinator | Nashville, TN | 2007 |
| Amaya Nielsen | 1801779905 | Behavior Technician | Concord, CA | 2025 |
| Amber Nielsen, LISW | 1316296486 | Social Worker | Britt, IA | 2012 |
| Ambryan Nielsen | 1316459431 | Counselor | Taylorsville, UT | 2017 |
| Amy Nielsen, FNP-C | 1255839106 | Family Nurse Practitioner | Williamsport, PA | 2018 |
| Amy Nielsen, MOTR | 1285771519 | Occupational Therapist | North Salt Lake, UT | 2007 |
| Amy Nielsen, D.O. | 1356736995 | Surgery Physician | Escanaba, MI | 2015 |
| Amy Nielsen, PA | 1457308421 | Physician Assistant | Grand Rapids, MI | 2006 |
| Amy Nielsen, D.O. | 1730110529 | Neurology Physician | La Jolla, CA | 2006 |
| Amy Nielsen, CRNA | 1760430151 | Certified Registered Nurse Anesthetist | Tacoma, WA | 2006 |
| Amy Nielsen | 1902194210 | Developmental Therapist | Galesburg, IL | 2011 |
| Andrea Nielsen, RN | 1417783135 | School Registered Nurse | Ballston Spa, NY | 2024 |
| Andrea Nielsen, ATC | 1952865347 | Athletic Trainer | Midland, TX | 2019 |
| Andrea Nielsen, OD | 1962628479 | Optometrist | Royal Oak, MI | 2007 |
| Andrew Nielsen, OTR/L | 1033840681 | Occupational Therapist | St George, UT | 2022 |
| Andrew Nielsen, PT, DPT | 1053806703 | Orthopedic Physical Therapist | Gillette, WY | 2018 |
| Andrew Nielsen, M.D. | 1093155913 | Internal Medicine Physician | Columbia, TN | 2013 |
| Andrew Nielsen, PA-C | 1245505858 | Medical Physician Assistant | Joint Base Lewis McChord, WA | 2012 |
| Andrew Nielsen, PHARMD | 1295384014 | Pharmacist | Owego, NY | 2019 |
| Andrew Nielsen, PA-C | 1609431709 | Physician Assistant | Moses Lake, WA | 2019 |
| Andrew Nielsen | 1790451219 | Physical Therapist | Cambridge, MD | 2021 |
| Andrew Nielsen | 1982494167 | Student in an Organized Health Care Education/Training Program | Provo, UT | 2025 |
| Angela Nielsen | 1225977879 | Social Worker | Riverton, KS | 2026 |
| Angela Nielsen, PMHNP | 1457708885 | Psychiatric/Mental Health Nurse Practitioner | Columbus, IN | 2016 |
| Angela Nielsen | 1720379217 | Mental Health Counselor | Portland, OR | 2011 |
| Ann Nielsen, MS, PHD, LMHC | 1518102359 | Mental Health Counselor | Seminole, FL | 2008 |
| Anna Nielsen, LMSW | 1093695181 | Social Worker | Penfield, NY | 2025 |
| Anna Nielsen | 1700137080 | Counselor | Everett, WA | 2012 |
| Anna Nielsen | 1881198398 | Behavior Technician | American Canyon, CA | 2018 |
| Anna Nielsen | 1942741970 | Registered Dietitian | Rockford, IL | 2017 |
| Annabel Nielsen, APCC | 1144073800 | Mental Health Counselor | Los Angeles, CA | 2024 |
| Annabelle Nielsen, MD | 1578198651 | Emergency Medicine Physician | Sewickley, PA | 2020 |
| Anne Nielsen | 1447909155 | Psychiatry Physician | Chicago, IL | 2022 |
| Anne Nielsen, DNP, ARNP, CPNP-PC | 1558883769 | Pediatric Nurse Practitioner | Iowa City, IA | 2017 |
| Anne Nielsen, NP | 1689971046 | Adult Health Nurse Practitioner | Orlando, FL | 2011 |
| Anneli Nielsen, AMFT | 1023737228 | Marriage & Family Therapist | Ventura, CA | 2022 |
| Annette Nielsen, MD | 1053310185 | Pediatrics Physician | Orlando, FL | 2005 |
| Anthony Nielsen | 1104466432 | Physical Therapist | Minot Afb, ND | 2020 |
| Anton Nielsen, M.D. | 1457315632 | Cardiovascular Disease Physician | Houston, TX | 2006 |
| Arianna Nielsen, OTR | 1770262115 | Pediatric Occupational Therapist | Springvale, ME | 2023 |
| Arthur Nielsen, M.D. | 1376550822 | Psychiatry Physician | Chicago, IL | 2006 |
| Arvid Nielsen, RPH | 1568095800 | Pharmacist | Caledonia, MN | 2020 |
| Arya Nielsen, LAC | 1588744114 | Acupuncturist | New York, NY | 2006 |
| Aryon Nielsen, PA-C | 1477369510 | Medical Physician Assistant | Placerville, CA | 2024 |
| Ashley Nielsen, PA-C | 1124456462 | Physician Assistant | Philadelphia, PA | 2013 |
| Ashley Nielsen, PTA | 1225692916 | Physical Therapy Assistant | Sioux Falls, SD | 2019 |
| Ashley Nielsen, MS, LPC | 1316578263 | Mental Health Counselor | Fort Collins, CO | 2020 |
| Ashley Nielsen | 1396541223 | Adult Companion | Lincoln, NE | 2025 |
| Ashley Nielsen, LCSW | 1902262215 | Mental Health Counselor | Lincoln, NE | 2016 |
| Ashley Nielsen | 1912841396 | Speech-Language Pathologist | Chula Vista, CA | 2026 |
| Ashley Nielsen, FNP | 1992473276 | Family Nurse Practitioner | Abilene, TX | 2021 |
| Ashly Nielsen, CST | 1407273196 | Surgical Technologist | Fort Lauderdale, FL | 2014 |
| Aubrey Nielsen, APRN | 1225990443 | Nurse Practitioner | Council Bluffs, IA | 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).