Gary Ferenchick, M.D.
NPI 1891703666 · Internal Medicine Physician · East Lansing, MI
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gary Ferenchick, M.D. is a Internal Medicine Physician provider in East Lansing, MI (NPI 1891703666).
Provider details
- NPI number
- 1891703666
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 4301049491 (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
126 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 | 48 | $75 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 22 | $94 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 20 | $114 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 18 | $166 |
| Hospital Discharge Day Management, 30 Minutes Or Less99238 | 18 | $77 |
Typical Medicare-allowed amounts for these services range $75–$166 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 51 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 202 | 54 |
| Amlodipine Besylate | 124 | 28 |
| Lisinopril | 117 | 29 |
| Levothyroxine Sodium | 89 | 23 |
| Simvastatin | 71 | 14 |
| Tamsulosin Hcl | 70 | 22 |
| Triamterene/Hydrochlorothiazidbrand: Triamterene-Hydrochlorothiazid |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-08-04
- Last updated
- 2012-05-01
Frequently asked questions
- What is Gary Ferenchick's NPI number?
- Gary Ferenchick's National Provider Identifier (NPI) is 1891703666, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gary Ferenchick's specialty?
- Gary Ferenchick is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Gary Ferenchick located?
- Gary Ferenchick's practice location on file with NPPES is 804 Service Road, East Lansing, MI 48824-7040.
- What is Gary Ferenchick's phone number?
- The practice phone number listed in the NPPES registry for Gary Ferenchick is (517) 353-4941.
- Does Gary Ferenchick accept Medicare?
- Gary Ferenchick is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gary Ferenchick's NPI active?
- Yes — Gary Ferenchick's NPI (1891703666) is active in the NPPES registry as of the last update on 2012-05-01.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.