Grant Zimmerman, M.D., M.S.
NPI 1861923583 · Internal Medicine Physician · Columbus, OH
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Grant Zimmerman, M.D., M.S. is a Internal Medicine Physician provider in Columbus, OH (NPI 1861923583).
Provider details
- NPI number
- 1861923583
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D., M.S.
- Sex
- Male
- Sole proprietor
- No
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
9 yrs in NPPES registry
- Profile completeness28% of score
83% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
605 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 50 Minutes99233 | 213 | $112 |
| Hospital Discharge Day Management, More Than 30 Minutes99239 | 149 | $108 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 141 | $164 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 60 | $75 |
| Critical Care, First 30-74 Minutes99291 | 22 | $203 |
| Hospital Discharge Day Management, 30 Minutes Or Less99238 | 20 | $76 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 15 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Furosemide | 29 | 19 |
| Prednisone | 21 | 20 |
| Levofloxacin | 18 | 18 |
| Cefdinir | 15 | 15 |
| Cephalexin | 15 | 15 |
| Oxycodone Hcl | 15 | 14 |
| Atorvastatin Calcium | 14 | — |
| Potassium Chloride | 14 |
Practice location
Mailing address
Additional practice locations (1)
- 395 W 12th AveThird FloorColumbus, OH 43210-1267Phone: (614) 293-3989
Registry dates
- Enumerated
- 2017-03-23
- Last updated
- 2020-05-07
- Certified
- 2020-05-07
Frequently asked questions
- What is Grant Zimmerman's NPI number?
- Grant Zimmerman's National Provider Identifier (NPI) is 1861923583, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Grant Zimmerman's specialty?
- Grant Zimmerman is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Grant Zimmerman located?
- Grant Zimmerman's practice location on file with NPPES is 3525 Olentangy River Rd Ste 4330, Columbus, OH 43214-3937.
- What is Grant Zimmerman's phone number?
- The practice phone number listed in the NPPES registry for Grant Zimmerman is (614) 255-6900.
- Does Grant Zimmerman accept Medicare?
- Grant Zimmerman is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Grant Zimmerman's NPI active?
- Yes — Grant Zimmerman's NPI (1861923583) is active in the NPPES registry as of the last update on 2020-05-07.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.