Robert Feren, M.D.
NPI 1851453104 · Hospitalist Physician · Walnut Creek, CA
Enrolled with Medicare as Practitioner - Hospitalist · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Robert Feren, M.D. is a Hospitalist Physician provider in Walnut Creek, CA (NPI 1851453104).
Provider details
- NPI number
- 1851453104
- Entity type
- Individual
- Primary specialty
- Hospitalist PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- A89317 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
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
1,241 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 Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 588 | $116 |
| Hospital Discharge Day Management, More Than 30 Minutes99239 | 276 | $113 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 132 | $170 |
| Critical Care, First 30-74 Minutes99291 | 128 | $203 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 104 | $77 |
| Advance Care Planning, First 30 Minutes99497 | 13 | $74 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 8 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 22 | 16 |
| Pantoprazole Sodium | 18 | 11 |
| Levofloxacin | 16 | 16 |
| Potassium Chloride | 16 | 13 |
| Apixabanbrand: Eliquis | 15 | 11 |
| Cefdinir | 14 | 14 |
| Azithromycin | 12 | 12 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-12-14
- Last updated
- 2017-09-28
Frequently asked questions
- What is Robert Feren's NPI number?
- Robert Feren's National Provider Identifier (NPI) is 1851453104, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Robert Feren's specialty?
- Robert Feren is listed in the NPPES registry with a primary specialty of Hospitalist Physician (Allopathic & Osteopathic Physicians).
- Where is Robert Feren located?
- Robert Feren's practice location on file with NPPES is 1220 Rossmoor Pkwy, Walnut Creek, CA 94595-2501.
- What is Robert Feren's phone number?
- The practice phone number listed in the NPPES registry for Robert Feren is (925) 947-3393.
- Does Robert Feren accept Medicare?
- Robert Feren is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Robert Feren's NPI active?
- Yes — Robert Feren's NPI (1851453104) is active in the NPPES registry as of the last update on 2017-09-28.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.