William Greer, M.D., P.C.
NPI 1578674917 · Internal Medicine Physician · Paoli, PA
Enrolled with Medicare as Part B Supplier - Clinic/Group Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Greer, M.D., P.C. is a Internal Medicine Physician organization in Paoli, PA (NPI 1578674917).
Provider details
- NPI number
- 1578674917
- Entity type
- Organization
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Organization subpart
- No
- Authorized official
- William Greer, President(610) 651-0370
- License
- MD056544L (PA)
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
Other names (DBA / former)
- Doing business as
- William R. Greer, M.D., P.C.
Registry dates
- Enumerated
- 2006-08-31
- Last updated
- 2012-12-31
Frequently asked questions
- What is William Greer, M.D., P.C.'s NPI number?
- William Greer, M.D., P.C.'s National Provider Identifier (NPI) is 1578674917, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What type of organization is William Greer, M.D., P.C.?
- William Greer, M.D., P.C. is classified in the NPPES registry as Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is William Greer, M.D., P.C. located?
- William Greer, M.D., P.C.'s practice location on file with NPPES is 21 Industrial Blvd, Paoli, PA 19301-1610.
- What is William Greer, M.D., P.C.'s phone number?
- The practice phone number listed in the NPPES registry for William Greer, M.D., P.C. is (610) 651-0370.
- Does William Greer, M.D., P.C. accept Medicare?
- William Greer, M.D., P.C. 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 William Greer, M.D., P.C.?
- The authorized official listed on William Greer, M.D., P.C.'s NPPES record is William Greer, President. The authorized official registers and maintains the organization's NPI and is not necessarily its owner.
- Is William Greer, M.D., P.C.'s NPI active?
- Yes — William Greer, M.D., P.C.'s NPI (1578674917) is active in the NPPES registry as of the last update on 2012-12-31.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.