Ruth Hahn, MD
NPI 1528118262 · Obstetrics & Gynecology Physician · Fairfield, CA
Enrolled with Medicare as Practitioner - Obstetrics/Gynecology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Ruth Hahn, MD is a Obstetrics & Gynecology Physician provider in Fairfield, CA (NPI 1528118262).
Provider details
- NPI number
- 1528118262
- Entity type
- Individual
- Primary specialty
- Obstetrics & Gynecology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- A88964 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
2,320 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Subsequent Nursing Facility Care With Moderate Level of Medical Decision Making, Per Day, If Using Time, at Least 30 Minutes99309 | 1,415 | $115 |
| Subsequent Nursing Facility Care With High Level of Medical Decision Making, Per Day, If Using Time, at Least 45 Minutes99310 | 356 | $161 |
| Initial Nursing Facility Care With High Level of Medical Decision Making, Per Day, If Using Time, 50 Minutes Or More99306 | 320 | $188 |
| Subsequent Nursing Facility Care With Straightforward Level of Medical Decision Making, Per Day, If Using Time, 20 Minutes Or More99308 | 131 | $80 |
| Advance Care Planning, First 30 Minutes99497 | 64 | $79 |
| Nursing Facility Discharge Management, More Than 30 Minutes99316 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 72 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 158 | 24 |
| Gabapentin | 145 | 23 |
| Levothyroxine Sodium | 136 | 19 |
| Apixabanbrand: Eliquis | 122 | 17 |
| Amlodipine Besylate | 111 | 19 |
| Duloxetine Hcl | 79 | — |
| Tamsulosin Hcl |
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-01-12
- Last updated
- 2022-05-03
- Certified
- 2022-05-03
Frequently asked questions
- What is Ruth Hahn's NPI number?
- Ruth Hahn's National Provider Identifier (NPI) is 1528118262, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Ruth Hahn's specialty?
- Ruth Hahn is listed in the NPPES registry with a primary specialty of Obstetrics & Gynecology Physician (Allopathic & Osteopathic Physicians).
- Where is Ruth Hahn located?
- Ruth Hahn's practice location on file with NPPES is 1255 Travis Blvd, Fairfield, CA 94533-4801.
- What is Ruth Hahn's phone number?
- The practice phone number listed in the NPPES registry for Ruth Hahn is (510) 984-1103.
- Does Ruth Hahn accept Medicare?
- Ruth Hahn is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Ruth Hahn's NPI active?
- Yes — Ruth Hahn's NPI (1528118262) is active in the NPPES registry as of the last update on 2022-05-03.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.