William Robson Greer, M.D.
Internal Medicine Physician · Paoli, PA
William Robson Greer, M.D. is an internal medicine physician with a practice address in Paoli, Pennsylvania, and NPI 1598722472, issued on Apr 26, 2006. Check the license (Pennsylvania MD056544L, as entered in NPPES) on the Pennsylvania Department of State (PALS); the Medicare figures below come from public CMS files.
- Name
- William Robson Greer
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- MD056544L PA
Self-reported in NPPES; status is on the state search - Practice location
- 21 Industrial Blvd, Paoli, PA 19301
- Phone
- (610) 651-0370
- Enumerated
- Apr 26, 2006
- Record last updated
- Sep 12, 2008 (not updated in 18 years: call before relying on the address or phone)
- Fax
- (610) 651-7758
- Medicare enrollment
- Enrolled (PECOS I20100325000651); accepts Medicare assignment
- Medical or professional school
- Perelman School Of Med At The University Of Pennsylvania, 1993
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 7,300 in Pennsylvania → Look up another NPI →
Also registered at 21 Industrial Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify William Robson Greer in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersPennsylvania Department of State (PALS)
Search for license MD056544LCheck the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.4 times the Medicare Part D claims of the average internal medicine physician in 2024
7,488 Medicare Part D claims for 684 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 10% of claims. 48 claims were for opioids.
Most prescribed
- Atorvastatin Calcium705 claims
- Losartan Potassium401 claims
- Amlodipine Besylate380 claims
- Rosuvastatin Calcium239 claims
- Simvastatin230 claims
- Lisinopril212 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through one group practice
- Phoenix Rehabilitation And Health Services IncCranberry Twp, PA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
William Robson Greer among 7,300 internal medicine physician records in Pennsylvania
William Robson Greer, M.D. is one of 7,300 internal medicine physician records with a practice address in Pennsylvania. 78% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 9% of them.
- NPI issued2006 · 9% of these records are older, 64% newer
- In a Medicare fileYes · 78% of these records are
- In the CMS Doctors and Clinicians fileYes · 58% of these records are
- Graduated1993 · median 2008 among the 4,208 with a school on file
- Record last updated2008 · 56% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Pennsylvania practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
40 internal medicine physician records list a practice address in Paoli
They are 40 of the 902 NPPES records with a practice address in Paoli, and 7,300 internal medicine physician records in Pennsylvania.
All 7,300 in Pennsylvania → Every provider in Paoli → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Peter Blackstone, D.O.Paoli, PA 193011053391854
- Martamarie Byron, MDPaoli, PA 193011891768669
- Jill Cohen, DOPaoli, PA 193011962479576
- Damian Cornacchia, D.O.Paoli, PA 193011417936550
- Victoriya Hageney, M.D.Paoli, PA 193011679576144
- Ralph Lanza, MDPaoli, PA 193011285601039
- Mark Levy, MDPaoli, PA 193011194765297
- Christopher Lucas, DOPaoli, PA 193011538136387
Common questions
What is William Robson Greer, M.D.'s NPI number?
William Robson Greer, M.D.'s National Provider Identifier (NPI) is 1598722472, issued on Apr 26, 2006. An NPI identifies a provider in billing; it is not a license.
Where is William Robson Greer, M.D. located?
The NPPES record lists a practice address at 21 Industrial Blvd, Paoli, PA, 19301. Phone: (610) 651-0370. Providers update this record themselves, so call before visiting.
How can I verify William Robson Greer, M.D.'s license?
NPPES lists Pennsylvania license number MD056544L, as entered by the provider. Search the Pennsylvania Department of State (PALS) at https://www.pals.pa.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does William Robson Greer, M.D. prescribe under Medicare Part D?
In 2024, William Robson Greer, M.D. had 7,488 Medicare Part D claims for 684 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.