NPPES file of Aug 9, 2026

Katherine Onnen Ryken, M.D.

Obstetrics & Gynecology Physician · Buffalo, NY

Katherine Onnen Ryken, M.D. is an obstetrics & gynecology physician with a practice address in Buffalo, New York, and NPI 1487185633, issued on Mar 21, 2017. Check the license (New York 322155, as entered in NPPES) on the NYS Education Department, Office of the Professions; the federal record below is the public data PlainDoctor holds for this provider.

Record from CMS NPPES, file of Aug 9, 2026 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1487185633
Name
Katherine Onnen Ryken
Credential
M.D.
Primary taxonomy
Obstetrics & Gynecology Physician 207V00000X
License numbers
322155 NY
241504 AK
0076454 CO
MD29498 ME
MD61136628 WA
Self-reported in NPPES; status is on the state search
Practice location
565 Abbott RD, Buffalo, NY 14220
Phone
(206) 520-5000
Enumerated
Mar 21, 2017
Record last updated
Mar 27, 2026
Medicaid ID
1487185633 WA
Medicare enrollment
Enrolled (PECOS I20250911003412); may accept Medicare assignment
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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8 nearest obstetrics & gynecology physician records → All 3,174 in New York → Look up another NPI →

Also registered at 565 Abbott RD

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Hany Abdel Messeh, M.DInternal Medicine Physician1689931644
  2. Joel Acquard, PA-CMedical Physician Assistant1386441616
  3. Tariq Ahmad, M.D.Hospitalist Physician1619901113
  4. Jamal Al Taani, MDVascular & Interventional Radiology Physician1083819593
  5. Michael Albert, MDAnatomic Pathology & Clinical Pathology Physician1386602118
  6. Catherine Almeter, PAPhysician Assistant1003480195

Verify Katherine Onnen Ryken in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersNYS Education Department, Office of the Professions
    Search for license 322155    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Open the New York license search

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

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Katherine Onnen Ryken among 3,174 obstetrics & gynecology physician records in New York

Katherine Onnen Ryken, M.D. is one of 3,174 obstetrics & gynecology physician records with a practice address in New York. 76% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2017, is newer than 86% of them.

  • NPI issued2017 · 86% of these records are older, 12% newer
  • In a Medicare fileNo · 76% of these records are
  • In the CMS Doctors and Clinicians fileYes · 59% of these records are
  • Graduated2017 · median 2002 among the 1,870 with a school on file
  • Record last updated2026 · 63% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207V00000X and a New York practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Obstetrics & Gynecology Physician providers in New York

There are 3,174 obstetrics & gynecology physician records in New York. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.

All 3,174 in New York → Every provider in Buffalo → Obstetrics & Gynecology Physician nationwide →

The 8 obstetrics & gynecology physician records with the nearest ZIP codes

  1. Joanne Arnold, MDWilliamsville, NY 142211912926809
  2. August Bruno, M.D.Orchard Park, NY 142211013996131
  3. Gabriel Chouchani, M.D.Williamsville, NY 142211629062013
  4. Adel Chouchani, M.D.Williamsville, NY 142211255325650
  5. Susan Erk, DOWilliamsville, NY 142211477520203
  6. Margarita Giotis, MDWilliamsville, NY 142211245276203
  7. Lawrence Gugino, M.D.Blasdell, NY 142191770586372
  8. Suzette Lajeunesse, M.D.Williamsville, NY 142211881600609

Common questions

What is Katherine Onnen Ryken, M.D.'s NPI number?

Katherine Onnen Ryken, M.D.'s National Provider Identifier (NPI) is 1487185633, issued on Mar 21, 2017. An NPI identifies a provider in billing; it is not a license.

Where is Katherine Onnen Ryken, M.D. located?

The NPPES record lists a practice address at 565 Abbott RD, Buffalo, NY, 14220. Phone: (206) 520-5000. Providers update this record themselves, so call before visiting.

How can I verify Katherine Onnen Ryken, M.D.'s license?

NPPES lists New York license number 322155, as entered by the provider. Search the NYS Education Department, Office of the Professions at https://www.op.nysed.gov/services/verifications/online-verification-searches. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.

Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. An NPI identifies who bills; it is not a license.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.