Providers Stacey Siemers, APRN to Janiece Sieracki, PTA
300 individual NPIs in the federal registry, part 20,177 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. 82 link to a page of their own with Medicare and CMS data the registry does not carry.
| Provider | NPI | Specialty | Practice city | NPI issued |
|---|---|---|---|---|
| Stacey Siemers, APRN | 1649721721 | Family Nurse Practitioner | Norman, OK | 2016 |
| Steven Siemers, RPH | 1598047649 | Pharmacist | Perth Amboy, NJ | 2011 |
| Tamara Siemers, OTR | 1831305069 | Pediatric Occupational Therapist | Durango, CO | 2007 |
| Tami Siemers | 1710609417 | Counselor | Seattle, WA | 2022 |
| Trent Siemers, CRNA | 1326154956 | Certified Registered Nurse Anesthetist | Bismarck, ND | 2006 |
| Victoria Siemers, ARNP | 1124016076 | Nurse Practitioner | Iowa City, IA | 2005 |
| Mary Siemes, PH.D. | 1396140844 | Clinical Psychologist | Chappaqua, NY | 2014 |
| Angela Siemiaczko, MS, RD, LD | 1437257128 | Registered Dietitian | Charlton Heights, WV | 2006 |
| Walter Siemian, M.D. | 1225041585 | Plastic Surgery Physician | Ocoee, FL | 2006 |
| Carly Siemianowski | 1932848173 | Physician Assistant | Columbia, SC | 2022 |
| Edith Siemianowski, MT(ASCP) | 1215102157 | Medical Technologist | Hines, IL | 2008 |
| James Siemianowski | 1417415944 | Clinical Social Worker | West Springfield, MA | 2019 |
| Robert Siemianowski, R.PH. | 1801178959 | Pharmacist | Batavia, IL | 2011 |
| William Siemiaszko, DDS | 1720295009 | Dentist | Seekonk, MA | 2007 |
| Kayley Siemiatkoski, MD | 1598515082 | Student in an Organized Health Care Education/Training Program | Springfield, MA | 2024 |
| Marissa Siemiatkoski | 1528685898 | Student in an Organized Health Care Education/Training Program | Waterbury, CT | 2020 |
| Matthew Siemiawski | 1558719732 | Pharmacist | Chesterton, IN | 2016 |
| David Siemien | 1457087108 | Physical Therapy Assistant | Rockville, MD | 2022 |
| Joseph Siemienczuk, MD | 1619900230 | Internal Medicine Physician | Portland, OR | 2006 |
| Steven Siemieniak, DO | 1659965598 | Emergency Medicine Physician | Jbsa Lackland, TX | 2021 |
| Judy Siemieniec, RDH | 1194835769 | Dental Hygienist | Vancouver, WA | 2006 |
| Jaina Siemienkowicz | 1932708765 | Behavior Technician | Chicago, IL | 2020 |
| Kathryn Siemienski | 1295339851 | Registered Dietitian | Wilmington, DE | 2020 |
| Katrina Siemiesz, MD | 1659900553 | Family Medicine Physician | Salina, KS | 2020 |
| Erika Siemiet, DDS | 1770709057 | General Practice Dentistry | Palm Harbor, FL | 2007 |
| Kouaoh-Bia Siemiezaw | 1265790208 | Home Health Aide | Washington, DC | 2012 |
| Heather Sieminkewicz, PA | 1558770701 | Physician Assistant | Indiana, PA | 2014 |
| Joanna Sieminska | 1467888602 | Physical Therapist | Evanston, IL | 2013 |
| Angela Sieminski | 1891635504 | Physical Therapist | Charlottesville, VA | 2026 |
| Barbara Sieminski | 1003147034 | Occupational Therapist | Kingston, PA | 2010 |
| Daniel Sieminski | 1679413389 | Physical Therapist | Charlottesville, VA | 2026 |
| Douglas Sieminski, DO | 1922066125 | Family Medicine Physician | Newton, NJ | 2006 |
| Jessica Sieminski, DO/MPH | 1982455937 | Student in an Organized Health Care Education/Training Program | Stockton, CA | 2024 |
| Louis Sieminski, PH.D. | 1023050663 | Audiologist-Hearing Aid Fitter | Forty Fort, PA | 2006 |
| Mark Sieminski, MD | 1003057779 | Emergency Medicine Physician | Cheektowaga, NY | 2009 |
| Sandra Sieminski, M.D. | 1578739793 | Ophthalmology Physician | Buffalo, NY | 2008 |
| Shannon Sieminski | 1629617840 | Behavior Technician | Draper, UT | 2020 |
| Tara Sieminski | 1285514760 | Mental Health Counselor | Eugene, OR | 2025 |
| Elizabeth Siemion, RBT | 1275224297 | Behavior Technician | Sun City West, AZ | 2023 |
| McKenzie Siemion | 1720438682 | Family Nurse Practitioner | Gilbert, AZ | 2016 |
| Michele Siemion | 1922275429 | Acupuncturist | Bellingham, WA | 2008 |
| Valeria Siemion, MD | 1639151152 | Family Medicine Physician | Kirkland, WA | 2005 |
| Victoria Siemion, MSN, CRNP, FNP-BC | 1821732181 | Family Nurse Practitioner | King Of Prussia, PA | 2022 |
| Wendy Siemion, MD | 1720309461 | Internal Medicine Physician | Indianapolis, IN | 2010 |
| Patricia Siemionko, ARNP | 1992838536 | Nurse Practitioner | Seffner, FL | 2007 |
| Krzysztof Siemionow, M.D. | 1689841314 | Orthopaedic Surgery of the Spine Physician | Homer Glen, IL | 2008 |
| Maria Siemionow, M.D. | 1316902851 | Plastic Surgery Physician | Cleveland, OH | 2006 |
| Amy Siemon, LGC | 1073083507 | Genetic Counselor (M.S.) | Columbus, OH | 2018 |
| Brett Siemon | 1073132437 | Anesthesiologist Assistant | Columbus, OH | 2020 |
| Derek Siemon, DDS | 1700893856 | General Practice Dentistry | Annapolis, MD | 2006 |
| Johanna Siemon, OTR/L | 1427281864 | Pediatric Occupational Therapist | Fort Bragg, NC | 2009 |
| John Siemon | 1962819276 | Gynecologic Oncology Physician | Miramar, FL | 2014 |
| Kathleen Siemon, NEBRASKA | 1376405118 | Adult Companion | Grand Island, NE | 2025 |
| Kristin Siemon, PA-C | 1871596940 | Physician Assistant | Clairton, PA | 2005 |
| Lori Lee Siemon, DO | 1235154923 | Emergency Medicine Physician | Pittsburgh, PA | 2006 |
| Lynda Siemon, ND | 1942682315 | Sports Medicine (Preventive Medicine) Physician | Los Gatos, CA | 2015 |
| Mark Siemon, PHD, RN, PHNA-BC | 1639016264 | Community Health Registered Nurse | Teec Nos Pos, AZ | 2026 |
| Mary Siemon, RN ARNP | 1891802641 | Nurse Practitioner | Seattle, WA | 2006 |
| Pamela Siemon, LCSW | 1821348871 | Clinical Social Worker | Watertown, CT | 2012 |
| Rachael Siemon-Carome, LCSW | 1295266922 | Clinical Social Worker | Chicago, IL | 2017 |
| Ashley Siemonh, N.P. | 1740842475 | Women's Health Nurse Practitioner | Waldorf, MD | 2019 |
| Ashley Siemons, MD | 1790309789 | Family Medicine Physician | Charles City, IA | 2020 |
| Christy Siemons, M.A. | 1104080894 | Mental Health Counselor | Lynnwood, WA | 2008 |
| Gary Siemons, M.D. | 1427059930 | Colon & Rectal Surgery Physician | Voorhees, NJ | 2005 |
| Genna Siemons, M.D. | 1902210388 | Family Medicine Physician | Kansas City, MO | 2014 |
| Rachel Siemons, MD | 1942879044 | Student in an Organized Health Care Education/Training Program | Los Angeles, CA | 2021 |
| Justin Siemonsma, DPT | 1821481268 | Physical Therapist | Vermillion, SD | 2015 |
| Morgan Siemonsma | 1811669211 | Behavior Technician | Kailua, HI | 2021 |
| Stephanie Siemonsma, REGISTERED NURSE | 1538975651 | Gastroenterology Registered Nurse | Omaha, NE | 2024 |
| Jacqueline Siempelkamp | 1861922023 | Mental Health Counselor | Saint Louis, MO | 2017 |
| Kaitlin Siempelkamp, LCSW-MA | 1083447098 | Social Worker | Boston, MA | 2024 |
| Aaron Siems, RPH | 1962785535 | Pharmacist | Franklin, IN | 2011 |
| Albert Siems | 1972843936 | Occupational Therapy Assistant | Seattle, WA | 2013 |
| Amanda Siems, L.S.W | 1689871089 | Social Worker | Chubbuck, ID | 2007 |
| Ami Siems, M.D. | 1255348306 | Family Medicine Physician | Yukon, OK | 2006 |
| Ashley Siems, M.D. | 1174757926 | Pediatric Critical Care Medicine Physician | St Petersburg, FL | 2009 |
| Broc Siems, CRNA | 1487979282 | Certified Registered Nurse Anesthetist | Rochester, MN | 2010 |
| Brooke Siems | 1548503147 | Counselor | Peabody, MA | 2013 |
| Cameron Siems, PHARMD | 1700497864 | Pharmacist | Oak Ridge, TN | 2020 |
| Carmen Siems, LCSW | 1609346048 | Clinical Social Worker | Richmond Heights, MO | 2018 |
| Chesney Siems, MD | 1083101059 | Surgery Physician | Minneapolis, MN | 2018 |
| Christina Siems, MD | 1811632904 | Student in an Organized Health Care Education/Training Program | Chapel Hill, NC | 2022 |
| Edward Siems, MD | 1467514497 | Anesthesiology Physician | Rockville Centre, NY | 2006 |
| Heather Siems, LMP | 1164687505 | Massage Therapist | Olympia, WA | 2008 |
| James Siems | 1558206680 | Personal Care Attendant | Las Vegas, NV | 2026 |
| Jason Siems | 1770303885 | Peer Specialist | Brook Park, MN | 2024 |
| Jenee Siems | 1003586702 | Professional Counselor | Redding, CA | 2021 |
| Jon Siems, M.D. | 1528068640 | Specialist | Las Vegas, NV | 2005 |
| Judy Siems, PHD LADC | 1154603116 | Addiction (Substance Use Disorder) Psychologist | Minnetonka, MN | 2011 |
| Kathryn Siems, PA | 1356781579 | Physician Assistant | Austin, TX | 2013 |
| Kelly Siems, R.N. | 1487964136 | Home Health Registered Nurse | Bemidji, MN | 2010 |
| Laura Siems, MD | 1467456202 | Family Medicine Physician | Huntingdon, PA | 2005 |
| Lauren Siems, C.G.C. | 1053860874 | Genetic Counselor (M.S.) | Los Angeles, CA | 2016 |
| Madison Siems, M.S., CF-SLP | 1902732092 | Speech-Language Pathologist | Little Rock, AR | 2026 |
| Martin Siems, M.D. | 1245222116 | Orthopaedic Surgery Physician | Little Rock, AR | 2005 |
| Megan Siems, PT | 1881008027 | Physical Therapist | Columbus, MS | 2014 |
| Michael Siems, PHARMD | 1467140590 | Pharmacist | Marshfield, WI | 2023 |
| Morgan Siems, PT | 1447885462 | Physical Therapist | Fargo, ND | 2020 |
| Nicole Siems, D.O. | 1639404973 | Obstetrics & Gynecology Physician | Egg Harbor Township, NJ | 2009 |
| Paula Siems, PT | 1083747836 | Physical Therapist | Mason City, IA | 2007 |
| Ryan Siems, DPT | 1568949014 | Physical Therapist | Willowbrook, IL | 2018 |
| Zoe Siems | 1942988860 | Behavior Technician | Farmington Hills, MI | 2023 |
| Christina Siemsen, LCSW | 1184283020 | Clinical Social Worker | Chicago, IL | 2019 |
| Dennis Siemsen, OD | 1598742074 | Optometrist | Rochester, MN | 2005 |
| Georgene Siemsen, GNP | 1982619474 | Gerontology Nurse Practitioner | Bend, OR | 2006 |
| Jeffrey Siemsen, LCSW | 1629223490 | Clinical Social Worker | Kennett Square, PA | 2008 |
| Jolene Siemsen, A.N.P. | 1518184985 | Adult Health Nurse Practitioner | Eugene, OR | 2007 |
| Kathleen Siemsen, RPH | 1982985487 | Pharmacist | Antioch, IL | 2011 |
| Kurtis Siemsen, DC | 1851977789 | Chiropractor | Lake Geneva, WI | 2021 |
| Layce Siemsen, P.A.-C | 1851531586 | Physician Assistant | Concordia, KS | 2009 |
| Mary Siemsen, M.S. | 1215289285 | Speech-Language Pathologist | Newport, WA | 2012 |
| Mikayla Siemsen, CNP | 1992537393 | Primary Care Nurse Practitioner | Zimmerman, MN | 2024 |
| Miranda Siemsen | 1104570589 | Behavior Technician | Downers Grove, IL | 2022 |
| Rhea Siemsen, LPC-A, LCDC | 1740085521 | Addiction (Substance Use Disorder) Counselor | Allen, TX | 2025 |
| Scott Siemsen, APRN | 1215478995 | Family Nurse Practitioner | Lees Summit, MO | 2017 |
| Shannon Siemsen, OTR/L | 1437763513 | Occupational Therapist | Phoenix, AZ | 2020 |
| Stephanie Siemsen, RN, BSN, MS, NE-BC | 1568283489 | Administrator Registered Nurse | Papillion, NE | 2024 |
| Susan Siemsen, RPA-C | 1467495895 | Physician Assistant | Fort Worth, TX | 2006 |
| Emily Siemsglusz, M.A. CCC-SLP | 1134609621 | Speech-Language Pathologist | Brenham, TX | 2018 |
| Derek Sien | 1700577574 | Pharmacy Technician | Pryor, OK | 2023 |
| Elaine Sien, PHARM.D. | 1629120738 | Pharmacist | Fontana, CA | 2007 |
| Kaitlyn Sien, MA, AMFT | 1902444847 | Marriage & Family Therapist | Redwood City, CA | 2019 |
| Peter Sien, MD | 1053399568 | Radiation Oncology Physician | Kennewick, WA | 2006 |
| Sondra Sien, LMFT-A | 1386468098 | Marriage & Family Therapist | Fort Worth, TX | 2024 |
| Stefan Sien, D.O. | 1932319464 | Pulmonary Disease Physician | Murrieta, CA | 2007 |
| Stella Sien, D.O. | 1558592444 | Obstetrics & Gynecology Physician | Colton, CA | 2009 |
| Anna-Claire Siena, MD | 1013594902 | Internal Medicine Physician | Los Angeles, CA | 2021 |
| Dustin Siena, L.AC., DIPL.AC. D.AC | 1609042944 | Acupuncturist | Camarillo, CA | 2008 |
| Jenessa Siena | 1235657230 | Speech-Language Pathologist | Marquette Heights, IL | 2017 |
| Kristin Siena, MA CCC-SLP | 1164746152 | Speech-Language Pathologist | Vineland, NJ | 2010 |
| Matthew Siena, PHARMD | 1265808216 | Pharmacist | Chicago, IL | 2015 |
| Michelle Siena, N.P. | 1750495008 | Gerontology Nurse Practitioner | Rochester, NY | 2006 |
| Nicholas Siena | 1700414349 | Student in an Organized Health Care Education/Training Program | Los Angeles, CA | 2020 |
| Sabrina Siena | 1033728373 | Speech-Language Pathologist | Dix Hills, NY | 2020 |
| Santina Siena, MD | 1831116896 | Obstetrics & Gynecology Physician | East Providence, RI | 2006 |
| Steven Siena, DO | 1770386419 | Student in an Organized Health Care Education/Training Program | South Miami, FL | 2025 |
| Unknown Siena, O.D. | 1831262096 | Optometrist | Show Low, AZ | 2006 |
| Laura Sienas, MD | 1538507314 | Maternal & Fetal Medicine Physician | Portland, OR | 2013 |
| Annette Sienda | 1902089436 | Counselor | Tacoma, WA | 2007 |
| Heather Sienel, PA-C | 1528316544 | Physician Assistant | Charlton, MA | 2012 |
| Andrea Siener, MSPT | 1336166263 | Physical Therapist | Fort Collins, CO | 2006 |
| Catherine Siener, PT | 1578589883 | Physical Therapist | Saint Louis, MO | 2006 |
| Sierra Sienerth | 1841009784 | Behavior Technician | Saint Petersburg, FL | 2025 |
| Christopher Sienes, D.C. | 1508966334 | Chiropractor | Jackson, CA | 2006 |
| Dashalena Sieng | 1477496800 | Behavior Technician | San Jose, CA | 2026 |
| Jamie Sieng, DDS | 1568725885 | General Practice Dentistry | McKinney, TX | 2012 |
| Kayda Sieng | 1043187131 | Behavior Technician | Norwalk, CA | 2025 |
| Michelle Sieng | 1508731308 | Behavior Technician | San Ramon, CA | 2025 |
| Satia Sieng, BA | 1851305601 | Mental Health Counselor | Anaheim, CA | 2006 |
| Timothy Sieng | 1437993763 | Physical Therapist | Melbourne, FL | 2024 |
| Vouchmeng Sieng | 1265793798 | Community Health Worker | Long Beach, CA | 2012 |
| Catherine Siengsukon, PT | 1255536017 | Physical Therapist | Kansas City, KS | 2007 |
| Boonclaire Siengthai Papale, MD | 1194910455 | Pediatrics Physician | Pasadena, CA | 2007 |
| Taboh Sieni, MD | 1477139012 | Internal Medicine Physician | Indianapolis, IN | 2021 |
| Amy Sieniarecki, CPSS | 1952792533 | Peer Specialist | Troy, MI | 2015 |
| Cory Sieniawski | 1114481520 | Chiropractor | Medina, OH | 2019 |
| Rafal Sieniawski, M.D. | 1619127578 | Student in an Organized Health Care Education/Training Program | Syracuse, NY | 2008 |
| Danielle Sienicki | 1821747593 | Behavior Technician | Farmington Hills, MI | 2022 |
| Katherine Sienk, LMSW | 1417457532 | Social Worker | Rochester, NY | 2018 |
| Ann Sienkiel, CNS/ANP | 1013979947 | Clinical Nurse Specialist | Temple, TX | 2006 |
| McKenzie Sienkiewich | 1124673934 | Behavior Analyst | Spanaway, WA | 2019 |
| Paul Sienkiewich, DPT | 1942651302 | Physical Therapist | Little Elm, TX | 2016 |
| Adam Sienkiewicz, M.D. M.P.H | 1336536440 | Emergency Medicine Physician | Naples, FL | 2015 |
| Adrianna Sienkiewicz, LPC | 1891574232 | Professional Counselor | Clifton, NJ | 2023 |
| Alicia Sienkiewicz, PT, DPT | 1124547518 | Physical Therapist | Salem, NH | 2017 |
| Ann Sienkiewicz, LPN | 1235895285 | Licensed Practical Nurse | Salt Point, NY | 2021 |
| Ashley Sienkiewicz, DPT | 1730694324 | Physical Therapist | Brighton, MA | 2017 |
| Ashley Sienkiewicz | 1780185850 | Occupational Therapist | Springfield, MA | 2018 |
| Chimene Sienkiewicz, PHARM D | 1114362522 | Pharmacist | Wailuku, HI | 2013 |
| Danielle Sienkiewicz | 1548101025 | Professional Counselor | Southgate, MI | 2026 |
| David Sienkiewicz, RMHCI | 1275345639 | Mental Health Counselor | New Smyrna Beach, FL | 2025 |
| Erin Sienkiewicz, MD | 1073930392 | Obstetrics & Gynecology Physician | Concord, MA | 2014 |
| Genadij Sienkiewicz, M.D. | 1821036740 | Dermatology Physician | Vestal, NY | 2006 |
| Heather Sienkiewicz | 1497529200 | Community Health Worker | Burlington, VT | 2023 |
| Holly Sienkiewicz, RN | 1578108304 | School Registered Nurse | Livingston, MT | 2019 |
| Jeff Sienkiewicz, PA-C | 1487326765 | Physician Assistant | Puyallup, WA | 2021 |
| Jessica Sienkiewicz, PTA | 1770848673 | Physical Therapy Assistant | Oswego, NY | 2012 |
| Joann Sienkiewicz | 1144659194 | Physical Therapist | Bangor, PA | 2013 |
| Jori Sienkiewicz, PT | 1538939152 | Physical Therapist | Edenton, NC | 2024 |
| Kerenina Sienkiewicz | 1821703927 | Behavior Analyst | Farmington Hills, MI | 2023 |
| Kimberly Sienkiewicz, DPT | 1578174124 | Physical Therapist | Tampa, FL | 2020 |
| Laura Sienkiewicz, MS | 1417589755 | Nutrition Education Nutritionist | Johnson City, NY | 2020 |
| Lisa Sienkiewicz, LMFT | 1154850873 | Marriage & Family Therapist | Corona, CA | 2017 |
| Lisa Sienkiewicz, M.D. | 1942566906 | Orthopaedic Surgery Physician | West Allis, WI | 2012 |
| Mary Sienkiewicz, ARNP | 1245413533 | Nurse Practitioner | Bellevue, WA | 2007 |
| Michele Sienkiewicz, LCSW | 1164991410 | Doula | Aurora, CO | 2018 |
| Nicholas Sienkiewicz, DPT | 1760907075 | Physical Therapist | Salisbury, MA | 2017 |
| Paul Sienkiewicz, M.D. | 1346255775 | Orthopaedic Surgery Physician | Milwaukee, WI | 2006 |
| Rebecca Sienkiewicz, MSW | 1639493190 | Clinical Social Worker | Northville, MI | 2010 |
| Samantha Sienkiewicz | 1952046930 | Registered Nurse | Northport, NY | 2022 |
| Sophie Sienkiewicz | 1700677077 | Counselor | Salem, MA | 2025 |
| Stacey Sienkiewicz, LPN | 1508081399 | Licensed Practical Nurse | Plymouth Meeting, PA | 2007 |
| Stephanie Sienkiewicz, LCSW, COTA/L | 1528634136 | Clinical Social Worker | Lake In The Hills, IL | 2021 |
| Teresa Sienkiewicz, M.S., P.T. | 1538215785 | Physical Therapist | Newton, MA | 2007 |
| Teresa Sienkiewicz, FNP | 1932814779 | Family Nurse Practitioner | Jackson, MI | 2023 |
| Vincent Sienkiewicz | 1043346968 | Counselor | San Francisco, CA | 2007 |
| Whitney Sienkiewicz | 1952788473 | Speech-Language Pathologist | Pittsford, NY | 2015 |
| Alicia Sienkiewycz, FNP-C | 1689944027 | Family Nurse Practitioner | Potsdam, NY | 2012 |
| Nicholas Sienkiewycz, DC | 1679782858 | Chiropractor | Rochester, NY | 2007 |
| Lorianne Sienkivicz, B.S. | 1184764219 | Mental Health Counselor | Columbia, TN | 2007 |
| Charles Sienknecht, M.D. | 1740224526 | Rheumatology Physician | Hixson, TN | 2006 |
| Jason Sienknecht, MA | 1366564742 | Social Worker | Thornton, CO | 2007 |
| Melissa Sienknecht | 1669695938 | Registered Dietitian | Marshalltown, IA | 2007 |
| Stephen Sienknecht, PSY.D. | 1316017221 | Clinical Psychologist | Berkeley, CA | 2006 |
| Amy Sienko, APRN | 1275722696 | Pediatric Nurse Practitioner | New Haven, CT | 2007 |
| Andraia Sienko, LMSW | 1144014978 | Social Worker | Harrison, AR | 2025 |
| Anna Sienko | 1336698877 | Registered Nurse | Brooklyn, NY | 2016 |
| Dean Sienko, MD | 1831288398 | Public Health & General Preventive Medicine Physician | Lansing, MI | 2006 |
| Elyse Sienko, M.S. OTR/L | 1235301532 | Occupational Therapist | Hudson, WI | 2008 |
| Emilie Sienko, MD | 1588504047 | Student in an Organized Health Care Education/Training Program | New York, NY | 2026 |
| John Sienko, O.D. | 1194895524 | Optometrist | Wallingford, CT | 2006 |
| John Sienko, R.N. | 1508195371 | Registered Nurse | Sparks, NV | 2009 |
| Katlyn Sienko, OTR | 1790220226 | Occupational Therapist | Duluth, MN | 2016 |
| Kelly Sienko | 1144966235 | Behavior Technician | North Port, FL | 2022 |
| Liam Sienko | 1063001972 | Student in an Organized Health Care Education/Training Program | Spokane, WA | 2021 |
| Mark Sienko, M.D. | 1932146552 | Medical Oncology Physician | Sequim, WA | 2006 |
| Matilda Sienko, D.C. | 1609854553 | Chiropractor | Asheville, NC | 2006 |
| Maureen Sienko, OD | 1407830227 | Optometrist | Saratoga Springs, NY | 2005 |
| Monika Sienko, BA CADC | 1710752738 | Addiction (Substance Use Disorder) Counselor | Mc Lean, VA | 2023 |
| Peter Sienko, MD | 1770371247 | Student in an Organized Health Care Education/Training Program | Boston, MA | 2025 |
| Rachel Sienko, PHD | 1134617731 | Clinical Psychologist | Ann Arbor, MI | 2018 |
| Rebecca Sienko, RN | 1043417686 | Registered Nurse | Duluth, MN | 2007 |
| Royann Sienko, RN | 1982165098 | Registered Nurse | Saint Cloud, MN | 2019 |
| Sarah Sienko, PHARMD | 1912496308 | Pharmacist | Fort Wayne, IN | 2018 |
| Emily Sienkowski, DPT | 1376220301 | Physical Therapist | Spring, TX | 2023 |
| Frank Sienkowski, CRNA | 1073720397 | Certified Registered Nurse Anesthetist | Raleigh, NC | 2007 |
| Heather Sienkowski, RDH | 1538832282 | Dental Hygienist | Great Falls, MT | 2021 |
| Jeanine Sienkowski, APN | 1194807966 | Nurse Practitioner | Downers Grove, IL | 2006 |
| Lindzy Sienkowski, LPC | 1255792412 | Professional Counselor | Rochester Hills, MI | 2016 |
| Matthew Sienkowski, MS, AT, ATC, OTC | 1922416767 | Athletic Trainer | Grand Rapids, MI | 2014 |
| Gerald Siennicki, PA | 1700846912 | Medical Physician Assistant | Daytona Beach, FL | 2006 |
| Anne Sienrukos, APN | 1417774530 | Nurse Practitioner | Hackensack, NJ | 2024 |
| Leilani Siens | 1790646826 | Behavior Technician | Denver, CO | 2025 |
| Erik Sienty | 1588229181 | Physical Therapy Assistant | Sulphur Springs, TX | 2019 |
| Amal Sieny, LCSW | 1477400356 | Clinical Social Worker | Carbondale, IL | 2026 |
| Paige Sienza | 1396532644 | Student in an Organized Health Care Education/Training Program | West Bend, WI | 2025 |
| Kaylee Sienza-Duncan, M.S. CCC-SLP | 1316538762 | Speech-Language Pathologist | Spring Valley, IL | 2021 |
| Carolyn Sienzant, PA-C | 1437330214 | Physician Assistant | Harrisburg, PA | 2007 |
| Susan Siep, LCSW | 1033285366 | Clinical Social Worker | San Francisco, CA | 2006 |
| Samantha Siepak, PHARMD | 1417559212 | Pharmacist | Hillside, IL | 2020 |
| Kathleen Siepel, M.A, | 1790075372 | Psychologist | Erie, PA | 2011 |
| Timothy Siepel, MD | 1053348599 | Family Medicine Physician | West Valley, NY | 2006 |
| Jessica Siepelmeier, APRN | 1346069705 | Nurse Practitioner | Lincoln, NE | 2024 |
| Shannon Siepelmeyer, M.S., CCC-SLP | 1427802628 | Speech-Language Pathologist | Hastings, MN | 2024 |
| Danielle Sieper | 1720969116 | Speech-Language Pathologist | Hilton, NY | 2025 |
| Kimberly Sieper | 1700325495 | Addiction (Substance Use Disorder) Counselor | Manchester, NH | 2017 |
| Madison Sieperda, DO | 1003748807 | Surgery Physician | Wichita, KS | 2026 |
| Matthew Sieperda | 1063896371 | Pharmacist | Spirit Lake, IA | 2015 |
| Haiden Siepert, ATC, LAT | 1093132458 | Athletic Trainer | Pocatello, ID | 2014 |
| Kash Siepert, D.P.M. | 1689677031 | Podiatrist | Roseburg, OR | 2005 |
| Maria Siepi, DPT | 1861735946 | Physical Therapist | New York, NY | 2013 |
| Colleen Siepiela-Carmody | 1497607402 | Registered Dietitian | Waymart, PA | 2026 |
| Anna Siepierska, RNFA | 1356830681 | Registered Nurse First Assistant | Oak Lawn, IL | 2018 |
| Barbara Siepierski, MD | 1164451951 | Geriatric Medicine (Internal Medicine) Physician | Detroit, MI | 2006 |
| Jennifer Siepierski, M.S. | 1831491356 | Speech-Language Pathologist | Warsaw, NY | 2010 |
| Mary Siepierski, PA-C | 1396275970 | Physician Assistant | Bradford, PA | 2017 |
| Rebecca Siepierski | 1609114727 | Counselor | Tonawanda, NY | 2013 |
| Susan Siepierski, PA | 1609857952 | Physician Assistant | Detroit, MI | 2005 |
| Christopher Siepiora | 1386421907 | Physical Therapist | Chicago, IL | 2023 |
| Ashley Siepka, MSW | 1356796304 | Social Worker | Sterling, IL | 2016 |
| Eva Siepka, P.A. | 1467677781 | Physician Assistant | Arlington, MA | 2007 |
| Jenny Siepka, RN | 1730978594 | Registered Nurse | Charlottesville, VA | 2025 |
| Joseph Siepka, PT | 1043530090 | Physical Therapist | Hickory Hills, IL | 2010 |
| Natalie Siepka, LCSW | 1609325265 | Clinical Social Worker | Arlington, VA | 2016 |
| Reilly Siepka, DPT | 1760128045 | Physical Therapist | Chicago, IL | 2022 |
| Alison Siepker, LCSW | 1831420546 | Clinical Social Worker | Jacksonville, NC | 2010 |
| Donna Siepker | 1609536515 | Case Manager/Care Coordinator | Salt Lake City, UT | 2021 |
| Erica Siepker, BS | 1649085101 | Behavior Technician | Orange, CA | 2025 |
| Kathy Siepker, PHD, MSW, LCSW, CDP | 1932987633 | Clinical Social Worker | Grapevine, TX | 2023 |
| Lynda Siepker, AUD | 1376636514 | Audiologist | Bemidji, MN | 2006 |
| Dakota Sieple, RBT | 1235013756 | Behavior Technician | Terre Haute, IN | 2025 |
| Daniel Siepler, D.C. | 1477824134 | Chiropractor | Louisville, KY | 2012 |
| Kira Sieplinga, MD | 1235346198 | Pediatrics Physician | Grand Haven, MI | 2007 |
| April Siepman | 1447847595 | Mental Health Counselor | Kalamazoo, MI | 2020 |
| David Siepmann, MD | 1841269750 | Diagnostic Radiology Physician | McMinnville, OR | 2006 |
| Emma Siepmann | 1881407815 | Case Manager/Care Coordinator | Portland, OR | 2025 |
| Julie Siepmann, LCSW | 1083841878 | Clinical Social Worker | McMinnville, OR | 2009 |
| Rachel Siepmann | 1912723701 | Acupuncturist | Oconomowoc, WI | 2024 |
| Barbara Sieps, RP | 1255954665 | Pharmacist | Lincoln, NE | 2020 |
| Kelly Sieps, O.D. | 1568037554 | Optometrist | South Sioux City, NE | 2021 |
| Rachel Sieps | 1578006193 | Registered Nurse | Saint Paul, MN | 2016 |
| Claire Siepser, MA, MFA, MED | 1629711064 | Mental Health Counselor | Philadelphia, PA | 2022 |
| Steven Siepser, MD | 1891756375 | Ophthalmology Physician | Wayne, PA | 2006 |
| Stuart Siepser, MD | 1306809314 | Cardiovascular Disease Physician | Wayne, NJ | 2006 |
| Derrick Sier | 1669927331 | Mental Health Counselor | Oklahoma City, OK | 2016 |
| Grace Sier | 1356149256 | Student in an Organized Health Care Education/Training Program | Olney, MD | 2025 |
| Herbert Sier, MD | 1881627446 | Geriatric Medicine (Internal Medicine) Physician | Chicago, IL | 2006 |
| Kathy Sier | 1437754280 | Homemaker | Martinsburg, WV | 2020 |
| Marc Sier, RPH | 1942213855 | Pharmacist | Centerville, OH | 2006 |
| Nicole Sier, MS, CCC-SLP | 1083845465 | Speech-Language Pathologist | Madison, WI | 2009 |
| Rachel Sier, DO | 1396322079 | Student in an Organized Health Care Education/Training Program | Moreno Valley, CA | 2021 |
| Robertus Sier, PT | 1609376342 | Physical Therapist | Dearborn, MI | 2018 |
| Tequia Sier, MSW, LCSW | 1306163282 | Clinical Social Worker | Oklahoma City, OK | 2010 |
| Gregory Siera, RN | 1558773978 | Registered Nurse | Sitka, AK | 2014 |
| Karen Sieracke | 1376890996 | Licensed Practical Nurse | Cheektowaga, NY | 2012 |
| Barbara Sieracki | 1386598324 | Pediatric Neurodevelopmental Disabilities Physician | Maple Grove, MN | 2026 |
| Catherine Sieracki, LPN | 1962209254 | Licensed Practical Nurse | Rome, OH | 2025 |
| Connie Sieracki, AUD | 1720338866 | Audiologist | Sacramento, CA | 2012 |
| Destiny Sieracki | 1225604606 | Specialist | Alexandria, MN | 2021 |
| Janiece Sieracki, PTA | 1477841427 | Physical Therapy Assistant | San Antonio, TX | 2011 |
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).