Mark Douglas Ensberg, MD
Geriatric Medicine (Internal Medicine) Physician · Holt, MI
Mark Douglas Ensberg, MD is a geriatric medicine (internal medicine) physician with a practice address in Holt, Michigan, and NPI 1912936527, issued on Jul 3, 2006. Check the license (Michigan 4301048610, as entered in NPPES) on the Michigan Board of Medicine (LARA); the Medicare figures below come from public CMS files.
- Name
- Mark Douglas Ensberg
- Credential
- MD
- Primary taxonomy
- Geriatric Medicine (Internal Medicine) Physician 207RG0300X
- License number
- 4301048610 MI
Self-reported in NPPES; status is on the state search - Practice location
- 5091 Willoughby RD, Holt, MI 48842
- Phone
- (517) 694-2144
- Enumerated
- Jul 3, 2006
- Record last updated
- Jun 12, 2019 (not updated in 7 years: call before relying on the address or phone)
- Fax
- (517) 694-6570
- Medicaid ID
- 2655771 MI
- Medicare enrollment
- Enrolled (PECOS I20060320000007); accepts Medicare assignment
- Medical or professional school
- Sanford School Of Medicine Of University Of South Dakota, 1981
- Entity
- Type 1 · individual
8 nearest geriatric medicine (internal medicine) physician records → All 184 in Michigan → Look up another NPI →
Also registered at 5091 Willoughby RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Kelli Abuan, OTROccupational Therapist1750879276
- Lisa Bower, M.S. CCC-SLPSpeech-Language Pathologist1669031662
- Latoya Brown, AGPCNP-CAdult Health Nurse Practitioner1871186429
- Pallav Deka, PHD, AGACNP-BCNurse Practitioner1861926636
- Gayle GreenmanPhysical Therapy Assistant1457918492
- Janice HeeneyPhysical Therapy Assistant1831756857
Verify Mark Douglas Ensberg in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMichigan Board of Medicine (LARA)
Search for license 4301048610Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
36% more Medicare Part D claims than the average geriatric medicine (internal medicine) physician in 2024
5,778 Medicare Part D claims for 125 beneficiaries, against an average of 4,246 among the 3,116 providers of this specialty who prescribed in Part D. Brand-name drugs were 13% of claims. 182 claims were for opioids.
Most prescribed
- Levothyroxine Sodium295 claims
- Amlodipine Besylate280 claims
- Furosemide278 claims
- Atorvastatin Calcium262 claims
- Duloxetine Hcl239 claims
- Pantoprazole Sodium223 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through one group practice
- Msu Health Care Inc.Holt, MI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mark Douglas Ensberg among 184 geriatric medicine (internal medicine) physician records in Michigan
Mark Douglas Ensberg, MD is one of 184 geriatric medicine (internal medicine) physician records with a practice address in Michigan. 76% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 8% of them.
- NPI issued2006 · 8% of these records are older, 43% newer
- In a Medicare fileYes · 76% of these records are
- In the CMS Doctors and Clinicians fileYes · 54% of these records are
- Graduated1981 · median 1997 among the 99 with a school on file
- Record last updated2019 · 60% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0300X and a Michigan practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Geriatric Medicine (Internal Medicine) Physician providers in Michigan
There are 184 geriatric medicine (internal medicine) physician records in Michigan.
All 184 in Michigan → Every provider in Holt → Geriatric Medicine (Internal Medicine) Physician nationwide →
The 8 geriatric medicine (internal medicine) physician records with the nearest ZIP codes
- William Bush, D.O.Howell, MI 488431730183575
- Claudia Finkelstein, MDEast Lansing, MI 488241245316090
- Sugandha Lowhim, MDEast Lansing, MI 488231255426326
- Nadir Abdelrahman, M.D.Dimondale, MI 488211417119892
- Raza Haque, MDLansing, MI 489121336197706
- James Mayle, MDLansing, MI 489151740239714
- Tazeen Ahmed, MDBay City, MI 487081356370944
- Daniel Brauner, MDKalamazoo, MI 490081619039161
Common questions
What is Mark Douglas Ensberg, MD's NPI number?
Mark Douglas Ensberg, MD's National Provider Identifier (NPI) is 1912936527, issued on Jul 3, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mark Douglas Ensberg, MD located?
The NPPES record lists a practice address at 5091 Willoughby RD, Holt, MI, 48842. Phone: (517) 694-2144. Providers update this record themselves, so call before visiting.
How can I verify Mark Douglas Ensberg, MD's license?
NPPES lists Michigan license number 4301048610, as entered by the provider. Search the Michigan Board of Medicine (LARA) at https://aca-prod.accela.com/MILARA/GeneralProperty/PropertyLookUp.aspx?isLicensee=Y&TabName=APO. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Mark Douglas Ensberg, MD prescribe under Medicare Part D?
In 2024, Mark Douglas Ensberg, MD had 5,778 Medicare Part D claims for 125 beneficiaries; the average among geriatric medicine (internal medicine) physician prescribers was 4,246. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.