Gregory Forstall, M.D.
NPI 1477642486 · Infectious Disease Physician · Flint, MI
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gregory Forstall, M.D. is a Infectious Disease Physician provider in Flint, MI (NPI 1477642486).
Provider details
- NPI number
- 1477642486
- Entity type
- Individual
- Primary specialty
- Infectious Disease PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 4301061462 (MI)
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
19 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
2,634 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) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 1,628 | $74 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 446 | $112 |
| Initial Hospital Care With Straightforward Or Low-Level Medical Decision Making, If Using Time, at Least 55 Minutes99222 | 329 | $123 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 93 | $163 |
| Subsequent Hospital Care With Straightforward Or Low Level of Medical Decision Making, Per Day, If Using Time, at Least 25 Minutes99231 | 54 | $47 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 27 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Vancomycin Hcl | 95 | 32 |
| Ceftriaxone Sodiumbrand: Ceftriaxone | 70 | 21 |
| Amoxicillin/Potassium Clavbrand: Amoxicillin-Clavulanate Potass | 64 | 48 |
| Cefepime Hcl | 54 | 18 |
| Bictegrav/Emtricit/Tenofov Alabrand: Biktarvy | 53 | — |
| Daptomycin | 53 | 13 |
| Piperacillin Sodium/Tazobactambrand: Piperacillin-Tazobactam | 52 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-10-11
- Last updated
- 2023-03-07
Frequently asked questions
- What is Gregory Forstall's NPI number?
- Gregory Forstall's National Provider Identifier (NPI) is 1477642486, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gregory Forstall's specialty?
- Gregory Forstall is listed in the NPPES registry with a primary specialty of Infectious Disease Physician (Allopathic & Osteopathic Physicians).
- Where is Gregory Forstall located?
- Gregory Forstall's practice location on file with NPPES is 401 S Ballenger Hwy, Flint, MI 48532-3638.
- What is Gregory Forstall's phone number?
- The practice phone number listed in the NPPES registry for Gregory Forstall is (810) 720-0639.
- Does Gregory Forstall accept Medicare?
- Gregory Forstall is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gregory Forstall's NPI active?
- Yes — Gregory Forstall's NPI (1477642486) is active in the NPPES registry as of the last update on 2023-03-07.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.