Catherine Gruer, MD
NPI 1245229897 · Geriatric Medicine (Internal Medicine) Physician · Allentown, PA
Enrolled with Medicare as Practitioner - Geriatric Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Catherine Gruer, MD is a Geriatric Medicine (Internal Medicine) Physician provider in Allentown, PA (NPI 1245229897).
Provider details
- NPI number
- 1245229897
- Entity type
- Individual
- Primary specialty
- Geriatric Medicine (Internal Medicine) PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- MD054780L (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
20 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.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 43 distinct drugs on file.
| Drug | Part D claims (2024) |
|---|---|
| Metformin Hcl | 94 |
| Atorvastatin Calcium | 88 |
| Gabapentin | 81 |
| Pantoprazole Sodium | 66 |
| Levothyroxine Sodium | 54 |
| Pravastatin Sodium | 53 |
| Divalproex Sodium | 52 |
| Losartan Potassium | 50 |
| Lisinopril | 45 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-10-17
- Last updated
- 2016-03-30
Frequently asked questions
- What is Catherine Gruer's NPI number?
- Catherine Gruer's National Provider Identifier (NPI) is 1245229897, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Catherine Gruer's specialty?
- Catherine Gruer is listed in the NPPES registry with a primary specialty of Geriatric Medicine (Internal Medicine) Physician (Allopathic & Osteopathic Physicians).
- Where is Catherine Gruer located?
- Catherine Gruer's practice location on file with NPPES is 17th & Chew Street, Allentown, PA 18105-7017.
- What is Catherine Gruer's phone number?
- The practice phone number listed in the NPPES registry for Catherine Gruer is (610) 969-3390.
- Does Catherine Gruer accept Medicare?
- Catherine Gruer is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Catherine Gruer's NPI active?
- Yes — Catherine Gruer's NPI (1245229897) is active in the NPPES registry as of the last update on 2016-03-30.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.