Catherine A. Ryan, M.D.
Gynecology Physician · Boulder, CO
Catherine A. Ryan, M.D. is a gynecology physician with a practice address in Boulder, Colorado, and NPI 1730295940, issued on Aug 21, 2006. Check the license (Colorado 40191, as entered in NPPES) on the Colorado Medical Board; the Medicare figures below come from public CMS files.
- Name
- Catherine A. Ryan
- Credential
- M.D.
- Primary taxonomy
- Gynecology Physician 207VG0400X
- License number
- 40191 CO
Self-reported in NPPES; status is on the state search - Practice location
- 4745 Arapahoe Ave Ste 110, Boulder, CO 80303
- Phone
- (303) 444-5110
- Enumerated
- Aug 21, 2006
- Record last updated
- Apr 6, 2017 (not updated in 9 years: call before relying on the address or phone)
- Fax
- (303) 444-7457
- Medicare enrollment
- Enrolled (PECOS I20040426000996); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest gynecology physician records → All 52 in Colorado → Look up another NPI →
Also registered at 4745 Arapahoe Ave Ste 110
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Sarah Curzon, PA-CPhysician Assistant1134695745
- Christine Hansen, M.D.Gynecology Physician1447362553
- Madison Lohmann, WHCNPWomen's Health Nurse Practitioner1174485650
- Mary Macsalka, M.D.Gynecology Physician1205942422
- Lauren Weaver, P.A.Physician Assistant1073887121
Verify Catherine A. Ryan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersColorado Medical Board
Search for license 40191Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Bills Medicare through one group practice
- Obstetrix Medical Group OF Colorado P CEnglewood, CO
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Catherine A. Ryan among 52 gynecology physician records in Colorado
Catherine A. Ryan, M.D. is one of 52 gynecology physician records with a practice address in Colorado. 46% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 23% of them.
- NPI issued2006 · 23% of these records are older, 31% newer
- In a Medicare fileYes · 46% of these records are
- In the CMS Doctors and Clinicians fileYes · 25% of these records are
- Graduated1998 · median 1998 among the 13 with a school on file
- Record last updated2017 · 79% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207VG0400X and a Colorado practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Gynecology Physician providers in Colorado
There are 52 gynecology physician records in Colorado.
All 52 in Colorado → Every provider in Boulder → Gynecology Physician nationwide →
The 8 gynecology physician records with the nearest ZIP codes
- Christine Hansen, M.D.Boulder, CO 803031447362553
- John Imig, M.D.Boulder, CO 803031801870530
- Mary Macsalka, M.D.Boulder, CO 803031205942422
- Ruth Weinberg, M.D.Boulder, CO 803011639305873
- Ann Mattson, MDBoulder, CO 803091912085952
- Gretchen Bruno, MDDenver, CO 802471518094556
- Paula VasichkoDenver, CO 802381508355975
- Ray Gottesfeld, M.D.Denver, CO 802201588932008
Common questions
What is Catherine A. Ryan, M.D.'s NPI number?
Catherine A. Ryan, M.D.'s National Provider Identifier (NPI) is 1730295940, issued on Aug 21, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Catherine A. Ryan, M.D. located?
The NPPES record lists a practice address at 4745 Arapahoe Ave Ste 110, Boulder, CO, 80303. Phone: (303) 444-5110. Providers update this record themselves, so call before visiting.
How can I verify Catherine A. Ryan, M.D.'s license?
NPPES lists Colorado license number 40191, as entered by the provider. Search the Colorado Medical Board at https://dpo.colorado.gov/Medical. 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. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
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.