Catherine Mary Gruer, MD
Geriatric Medicine (Internal Medicine) Physician · Allentown, PA
Catherine Mary Gruer, MD is a geriatric medicine (internal medicine) physician with a practice address in Allentown, Pennsylvania, and NPI 1245229897, issued on Oct 17, 2005. Check the license (Pennsylvania MD054780L, as entered in NPPES) on the Pennsylvania Department of State (PALS); the Medicare figures below come from public CMS files.
- Name
- Catherine Mary Gruer
- Credential
- MD
- Primary taxonomy
- Geriatric Medicine (Internal Medicine) Physician 207RG0300X
- License number
- MD054780L PA
Self-reported in NPPES; status is on the state search - Practice location
- 17TH & Chew Street, Allentown, PA 18105
- Phone
- (610) 969-3390
- Enumerated
- Oct 17, 2005
- Record last updated
- Mar 30, 2016 (not updated in 10 years: call before relying on the address or phone)
- Fax
- (610) 969-3393
- Entity
- Type 1 · individual
8 nearest geriatric medicine (internal medicine) physician records → All 228 in Pennsylvania → Look up another NPI →
Also registered at 17TH & Chew Street
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Elbert Chen, M.D.Obstetrics & Gynecology Physician1861621021
- Nasrideen Noor, MDPediatrics Physician1437444585
Verify Catherine Mary Gruer in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersPennsylvania Department of State (PALS)
Search for license MD054780LCheck the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
65% fewer Medicare Part D claims than the average geriatric medicine (internal medicine) physician in 2024
1,504 Medicare Part D claims for 72 beneficiaries, against an average of 4,246 among the 3,116 providers of this specialty who prescribed in Part D. Brand-name drugs were 13% of claims.
Most prescribed
- Metformin Hcl94 claims
- Atorvastatin Calcium88 claims
- Gabapentin81 claims
- Pantoprazole Sodium66 claims
- Levothyroxine Sodium54 claims
- Pravastatin Sodium53 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.
Catherine Mary Gruer among 228 geriatric medicine (internal medicine) physician records in Pennsylvania
Catherine Mary Gruer, MD is one of 228 geriatric medicine (internal medicine) physician records with a practice address in Pennsylvania. 72% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 86% newer
- In a Medicare fileYes · 72% of these records are
- In the CMS Doctors and Clinicians fileNo · 50% of these records are
- Record last updated2016 · 65% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0300X and a Pennsylvania practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Geriatric Medicine (Internal Medicine) Physician providers in Pennsylvania
There are 228 geriatric medicine (internal medicine) physician records in Pennsylvania.
All 228 in Pennsylvania → Every provider in Allentown → Geriatric Medicine (Internal Medicine) Physician nationwide →
The 8 geriatric medicine (internal medicine) physician records with the nearest ZIP codes
- Gene Ginsberg, MDAllentown, PA 181041831141787
- Caroline Shedlock, M.D.Allentown, PA 181031871521039
- Paula Jacobus, M.D.Allentown, PA 181021538193982
- Emilie Juin-Baptiste, M.DAllentown, PA 181021669883765
- Tatyana Kemarskaya, M.D.Allentown, PA 181021851371785
- Sunitha Potluri, MDAllentown, PA 181021437321353
- Russell Rentler, MDAllentown, PA 181021518996255
- Eileen Simak, D.O.Allentown, PA 181021073516670
Common questions
What is Catherine Mary Gruer, MD's NPI number?
Catherine Mary Gruer, MD's National Provider Identifier (NPI) is 1245229897, issued on Oct 17, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Catherine Mary Gruer, MD located?
The NPPES record lists a practice address at 17TH & Chew Street, Allentown, PA, 18105. Phone: (610) 969-3390. Providers update this record themselves, so call before visiting.
How can I verify Catherine Mary Gruer, MD's license?
NPPES lists Pennsylvania license number MD054780L, 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 Catherine Mary Gruer, MD prescribe under Medicare Part D?
In 2024, Catherine Mary Gruer, MD had 1,504 Medicare Part D claims for 72 beneficiaries; the average among geriatric medicine (internal medicine) physician prescribers was 4,246. 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.