Peter Greenberg, M.D.
NPI 1912033978 · Hematology (Internal Medicine) Physician · Stanford, CA
Enrolled with Medicare as Practitioner - Hematology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Peter Greenberg, M.D. is a Hematology (Internal Medicine) Physician provider in Stanford, CA (NPI 1912033978).
Provider details
- NPI number
- 1912033978
- Entity type
- Individual
- Primary specialty
- Hematology (Internal Medicine) PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- G14630 (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 tenure25% of score
19 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
3 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
132 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) |
|---|---|---|
| Telephone Medical Discussion With Physician, 21-30 Minutes99443 | 113 | $154 |
| New Patient Office Or Other Outpatient Visit With a High Level of Medical Decision Making, If Using Time, 60 Minutes Or More99205 | 19 | $262 |
Typical Medicare-allowed amounts for these services range $154–$262 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$21 across 1 record (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
Additional practice locations (2)
- 875 Blake Wilbur DriveRoom 2335, Stanford Univ Cancer CenterStanford, CA 94305Phone: (650) 725-8355Fax: (650) 723-1269
- 120 Ware RdWoodside, CA 94062-4537Phone: (650) 529-9422
Registry dates
- Enumerated
- 2007-02-26
- Last updated
- 2024-04-26
- Certified
- 2024-04-26
Frequently asked questions
- What is Peter Greenberg's NPI number?
- Peter Greenberg's National Provider Identifier (NPI) is 1912033978, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Peter Greenberg's specialty?
- Peter Greenberg is listed in the NPPES registry with a primary specialty of Hematology (Internal Medicine) Physician (Allopathic & Osteopathic Physicians).
- Where is Peter Greenberg located?
- Peter Greenberg's practice location on file with NPPES is 300 Pasteur Dr, Stanford, CA 94305-2200.
- What is Peter Greenberg's phone number?
- The practice phone number listed in the NPPES registry for Peter Greenberg is (650) 723-4000.
- Does Peter Greenberg accept Medicare?
- Peter Greenberg is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Peter Greenberg's NPI active?
- Yes — Peter Greenberg's NPI (1912033978) is active in the NPPES registry as of the last update on 2024-04-26.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.