George Grunberger, MD
NPI 1477558450 · Endocrinology, Diabetes & Metabolism Physician · Bloomfield Hills, MI
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
George Grunberger, MD is a Endocrinology, Diabetes & Metabolism Physician provider in Bloomfield Hills, MI (NPI 1477558450).
Provider details
- NPI number
- 1477558450
- Entity type
- Individual
- Primary specialty
- Endocrinology, Diabetes & Metabolism PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- Yes
- License
- 4301049764 (MI)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
21 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
2,510 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
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 .
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) |
|---|---|---|
| Hemoglobin A1c Level83036 | 665 | $9 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 581 | $128 |
| Continuous Monitoring of Blood Sugar Level in Tissue Fluid Using Sensor Under Skin With Interpretation and Report95251 | 390 | $34 |
| Blood Glucose (sugar) Level82947 | 323 | $4 |
| Training for Self-Care Or Home Management, Each 15 Minutes97535 | 133 | $32 |
| Urine Microalbumin (protein) Analysis82044 | 104 | $6 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 34 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Tirzepatidebrand: Mounjaro | 200 | 44 |
| Metformin Hcl | 200 | 61 |
| Semaglutidebrand: Ozempic | 82 | 23 |
| Dapagliflozin Propanediolbrand: Farxiga | 79 | 24 |
| Empagliflozinbrand: Jardiance | 76 | 23 |
| Pioglitazone Hcl | 68 | 19 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$92,755 across 193 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-06-16
- Last updated
- 2011-10-10
Frequently asked questions
- What is George Grunberger's NPI number?
- George Grunberger's National Provider Identifier (NPI) is 1477558450, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is George Grunberger's specialty?
- George Grunberger is listed in the NPPES registry with a primary specialty of Endocrinology, Diabetes & Metabolism Physician (Allopathic & Osteopathic Physicians).
- Where is George Grunberger located?
- George Grunberger's practice location on file with NPPES is 43494 Woodward Ave, Bloomfield Hills, MI 48302-5054.
- What is George Grunberger's phone number?
- The practice phone number listed in the NPPES registry for George Grunberger is (248) 335-7740.
- Does George Grunberger accept Medicare?
- George Grunberger is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is George Grunberger's NPI active?
- Yes — George Grunberger's NPI (1477558450) is active in the NPPES registry as of the last update on 2011-10-10.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.