James Y.greenberg, MD, a Professional Corporation
NPI 1003993247 · Internal Medicine Physician · San Francisco, CA
Enrolled with Medicare as Part B Supplier - Clinic/Group Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
James Y.greenberg, MD, a Professional Corporation is a Internal Medicine Physician organization in San Francisco, CA (NPI 1003993247).
Provider details
- NPI number
- 1003993247
- Entity type
- Organization
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Organization subpart
- No
- Authorized official
- James Greenberg, President(415) 474-7955
- License
- A55519 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
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.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-11-01
- Last updated
- 2012-12-03
Frequently asked questions
- What is James Y.greenberg, MD, a Professional Corporation's NPI number?
- James Y.greenberg, MD, a Professional Corporation's National Provider Identifier (NPI) is 1003993247, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What type of organization is James Y.greenberg, MD, a Professional Corporation?
- James Y.greenberg, MD, a Professional Corporation is classified in the NPPES registry as Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is James Y.greenberg, MD, a Professional Corporation located?
- James Y.greenberg, MD, a Professional Corporation's practice location on file with NPPES is 2299 Post St Ste 205, San Francisco, CA 94115-3473.
- What is James Y.greenberg, MD, a Professional Corporation's phone number?
- The practice phone number listed in the NPPES registry for James Y.greenberg, MD, a Professional Corporation is (415) 474-7955.
- Does James Y.greenberg, MD, a Professional Corporation accept Medicare?
- James Y.greenberg, MD, a Professional Corporation is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Who is the authorized official for James Y.greenberg, MD, a Professional Corporation?
- The authorized official listed on James Y.greenberg, MD, a Professional Corporation's NPPES record is James Greenberg, President. The authorized official registers and maintains the organization's NPI and is not necessarily its owner.
- Is James Y.greenberg, MD, a Professional Corporation's NPI active?
- Yes — James Y.greenberg, MD, a Professional Corporation's NPI (1003993247) is active in the NPPES registry as of the last update on 2012-12-03.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.