William Greer, M.D.
NPI 1598722472 · Internal Medicine Physician · Paoli, PA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Greer, M.D. is a Internal Medicine Physician provider in Paoli, PA (NPI 1598722472).
Provider details
- NPI number
- 1598722472
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- 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 tenure28% of score
20 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
3,992 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 1,599 | $131 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 662 | $93 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 410 | $133 |
| Advance Care Planning, First 30 Minutes99497 | 340 | $83 |
| Annual Depression Screening, 5 to 15 MinutesG0444 | 324 | $19 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 240 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 100 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 705 | 197 |
| Losartan Potassium | 401 | 110 |
| Amlodipine Besylate | 380 | 103 |
| Rosuvastatin Calcium | 239 | 77 |
| Simvastatin | 230 | 65 |
| Lisinopril | 212 | 58 |
| Levothyroxine Sodium |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-04-26
- Last updated
- 2008-09-12
Frequently asked questions
- What is William Greer's NPI number?
- William Greer's National Provider Identifier (NPI) is 1598722472, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Greer's specialty?
- William Greer is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is William Greer located?
- William Greer's practice location on file with NPPES is 21 Industrial Blvd, Paoli, PA 19301-1610.
- What is William Greer's phone number?
- The practice phone number listed in the NPPES registry for William Greer is (610) 651-0370.
- Does William Greer accept Medicare?
- William Greer is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Greer's NPI active?
- Yes — William Greer's NPI (1598722472) is active in the NPPES registry as of the last update on 2008-09-12.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.