Ruth A. Hahn, MD
Obstetrics & Gynecology Physician · Fairfield, CA
Ruth A. Hahn, MD is an obstetrics & gynecology physician with a practice address in Fairfield, California, and NPI 1528118262, issued on Jan 12, 2007. Check the license (California A88964, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Ruth A. Hahn
- Credential
- MD
- Primary taxonomy
- Obstetrics & Gynecology Physician 207V00000X
- License number
- A88964 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1255 Travis Blvd, Fairfield, CA 94533
- Phone
- (510) 984-1103
- Enumerated
- Jan 12, 2007
- Record last updated
- May 3, 2022
- Medicare enrollment
- Enrolled (PECOS I20091222000443); accepts Medicare assignment
- Medical or professional school
- George Washington University School Of Medicine, 2002
- Entity
- Type 1 · individual
8 nearest obstetrics & gynecology physician records → All 5,088 in California → Look up another NPI →
Also registered at 1255 Travis Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Michael TiopiancoGeriatric Physical Therapist1003431313
Verify Ruth A. Hahn in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A88964Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
18.9 times the Medicare Part D claims of the average obstetrics & gynecology physician in 2024
3,120 Medicare Part D claims for 229 beneficiaries, against an average of 165 among the 28,733 providers of this specialty who prescribed in Part D. 89 claims were for opioids.
Most prescribed
- Atorvastatin Calcium158 claims
- Gabapentin145 claims
- Levothyroxine Sodium136 claims
- Eliquis122 claims
- Amlodipine Besylate111 claims
- Duloxetine Hcl79 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The MIPS final score for 2023 (Medicare payment program): 5.2 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- Snf Specialists Medical CorporationFairfield, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Ruth A. Hahn among 5,088 obstetrics & gynecology physician records in California
Ruth A. Hahn, MD is one of 5,088 obstetrics & gynecology physician records with a practice address in California. 74% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 48% of them.
- NPI issued2007 · 48% of these records are older, 38% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileYes · 53% of these records are
- Graduated2002 · median 2004 among the 2,700 with a school on file
- Record last updated2022 · 64% 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 California 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 California
There are 5,088 obstetrics & gynecology physician records in California.
All 5,088 in California → Every provider in Fairfield → Obstetrics & Gynecology Physician nationwide →
The 8 obstetrics & gynecology physician records with the nearest ZIP codes
- Frederick Blair, M.D.Fairfield, CA 945331386731768
- Henry Chang, MDFairfield, CA 945331538247374
- Sangeeta Joshi, MDFairfield, CA 945331265510838
- Parveen Khan, MDFairfield, CA 945331194927392
- Andrew Lin, M.D.Fairfield, CA 945331689617565
- Pantea Pahlavan, M.D.Fairfield, CA 945331427021583
- Destiny Phillips, MDFairfield, CA 945331871236158
- Shanna Snow, D.O.Fairfield, CA 945331740483387
Common questions
What is Ruth A. Hahn, MD's NPI number?
Ruth A. Hahn, MD's National Provider Identifier (NPI) is 1528118262, issued on Jan 12, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Ruth A. Hahn, MD located?
The NPPES record lists a practice address at 1255 Travis Blvd, Fairfield, CA, 94533. Phone: (510) 984-1103. Providers update this record themselves, so call before visiting.
How can I verify Ruth A. Hahn, MD's license?
NPPES lists California license number A88964, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Ruth A. Hahn, MD prescribe under Medicare Part D?
In 2024, Ruth A. Hahn, MD had 3,120 Medicare Part D claims for 229 beneficiaries; the average among obstetrics & gynecology physician prescribers was 165. Part D covers Medicare prescriptions only.
What is Ruth A. Hahn, MD's MIPS final score?
The 2023 MIPS final score is 5.2 of 100. The average among 454,083 clinicians with a measured score was 83.5.
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.