Ralph Peterson, MD
NPI 1851311104 · Gastroenterology Physician · Oakland, CA
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Ralph Peterson, MD is a Gastroenterology Physician provider in Oakland, CA (NPI 1851311104).
Provider details
- NPI number
- 1851311104
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- Yes
- License
- G49099 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
19 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
1,022 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
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 .
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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 505 | $105 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 301 | $150 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 91 | $197 |
| Biopsy of Large Bowel Using a Flexible Endoscope45380 | 57 | $549 |
| Ultrasound Scan of Organ Tissue for Measuring Elasticity76981 | 39 | $138 |
| Biopsy of Esophagus, Stomach, And/Or Upper Small Bowel Using a Flexible Endoscope |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 20 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Famotidine | 296 | 79 |
| Dicyclomine Hcl | 191 | 52 |
| Pantoprazole Sodium | 131 | 40 |
| Linaclotidebrand: Linzess | 108 | 27 |
| Omeprazole | 90 | 26 |
| Dexlansoprazolebrand: Dexlansoprazole Dr | 70 | 15 |
| Tenofovir Alafenamidebrand: Vemlidy | 50 | — |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$10,244 across 32 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-07-20
- Last updated
- 2011-12-02
Frequently asked questions
- What is Ralph Peterson's NPI number?
- Ralph Peterson's National Provider Identifier (NPI) is 1851311104, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Ralph Peterson's specialty?
- Ralph Peterson is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Ralph Peterson located?
- Ralph Peterson's practice location on file with NPPES is 10520 Macarthur Blvd, Oakland, CA 94605-5248.
- What is Ralph Peterson's phone number?
- The practice phone number listed in the NPPES registry for Ralph Peterson is (510) 562-7467.
- Does Ralph Peterson accept Medicare?
- Ralph Peterson is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Ralph Peterson's NPI active?
- Yes — Ralph Peterson's NPI (1851311104) is active in the NPPES registry as of the last update on 2011-12-02.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.