Mark Ensberg, MD
NPI 1912936527 · Geriatric Medicine (Internal Medicine) Physician · Holt, MI
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Ensberg, MD is a Geriatric Medicine (Internal Medicine) Physician provider in Holt, MI (NPI 1912936527).
Provider details
- NPI number
- 1912936527
- Entity type
- Individual
- Primary specialty
- Geriatric Medicine (Internal Medicine) PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 4301048610 (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
269 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 Nursing Facility Care With Moderate Level of Medical Decision Making, Per Day, If Using Time, at Least 30 Minutes99309 | 129 | $102 |
| Subsequent Nursing Facility Care With Straightforward Level of Medical Decision Making, Per Day, If Using Time, 20 Minutes Or More99308 | 79 | $71 |
| Subsequent Nursing Facility Care With High Level of Medical Decision Making, Per Day, If Using Time, at Least 45 Minutes99310 | 23 | $146 |
| Initial Nursing Facility Care With Moderate Level of Medical Decision Making, Per Day, If Using Time, at Least 35 Minutes99305 | 22 | $126 |
| Nursing Facility Discharge Day Management, 30 Minutes Or Less99315 | 16 | $77 |
Typical Medicare-allowed amounts for these services range $71–$146 (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 · 77 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Levothyroxine Sodium | 295 | 18 |
| Amlodipine Besylate | 280 | 22 |
| Furosemide | 278 | 15 |
| Atorvastatin Calcium | 262 | 25 |
| Duloxetine Hcl | 239 | 13 |
| Pantoprazole Sodium | 223 | 18 |
| Potassium Chloride | 218 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-07-03
- Last updated
- 2019-06-12
Frequently asked questions
- What is Mark Ensberg's NPI number?
- Mark Ensberg's National Provider Identifier (NPI) is 1912936527, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Ensberg's specialty?
- Mark Ensberg is listed in the NPPES registry with a primary specialty of Geriatric Medicine (Internal Medicine) Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Ensberg located?
- Mark Ensberg's practice location on file with NPPES is 5091 Willoughby Rd, Holt, MI 48842-1054.
- What is Mark Ensberg's phone number?
- The practice phone number listed in the NPPES registry for Mark Ensberg is (517) 694-2144.
- Does Mark Ensberg accept Medicare?
- Mark Ensberg is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Ensberg's NPI active?
- Yes — Mark Ensberg's NPI (1912936527) is active in the NPPES registry as of the last update on 2019-06-12.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.