Keith Marcus, MD
NPI 1255371365 · Internal Medicine Physician · Ludington, MI
Enrolled with Medicare as Practitioner - Hospitalist · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Keith Marcus, MD is a Internal Medicine Physician provider in Ludington, MI (NPI 1255371365).
Provider details
- NPI number
- 1255371365
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 4301050045 (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
20 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
223 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) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 78 | $75 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 55 | $113 |
| Hospital Discharge Day Management, More Than 30 Minutes99239 | 44 | $109 |
| Exercise Or Drug-Induced Heart Stress Test With Electrocardiogram (ecg) With Supervision By Physician93016 | 20 | $19 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 13 | $165 |
| Hospital Discharge Day Management, 30 Minutes Or Less99238 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 8 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Pantoprazole Sodium | 23 | 18 |
| Omeprazole | 17 | — |
| Potassium Chloride | 15 | 13 |
| Cefuroxime Axetilbrand: Cefuroxime | 14 | 14 |
| Prednisone | 14 | 14 |
| Furosemide | 13 | — |
| Atorvastatin Calcium | 11 | — |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$352 across 7 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
- 2006-06-07
- Last updated
- 2024-03-01
- Certified
- 2024-03-01
Frequently asked questions
- What is Keith Marcus's NPI number?
- Keith Marcus's National Provider Identifier (NPI) is 1255371365, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Keith Marcus's specialty?
- Keith Marcus is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Keith Marcus located?
- Keith Marcus's practice location on file with NPPES is 1 Atkinson Dr, Ludington, MI 49431-1906.
- What is Keith Marcus's phone number?
- The practice phone number listed in the NPPES registry for Keith Marcus is (616) 391-3139.
- Does Keith Marcus accept Medicare?
- Keith Marcus is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Keith Marcus's NPI active?
- Yes — Keith Marcus's NPI (1255371365) is active in the NPPES registry as of the last update on 2024-03-01.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.