Diane Marie Howlin, M.D.
Internal Medicine Physician · Chelsea, MI
Diane Marie Howlin, M.D. is an internal medicine physician with a practice address in Chelsea, Michigan, and NPI 1417964552, issued on Aug 2, 2006. Check the license (Michigan 4301052421, as entered in NPPES) on the Michigan Board of Medicine (LARA); the Medicare figures below come from public CMS files.
- Name
- Diane Marie Howlin
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 4301052421 MI
Self-reported in NPPES; status is on the state search - Practice location
- 1620 Commerce Park Dr, Chelsea, MI 48118
- Phone
- (734) 475-2921
- Enumerated
- Aug 2, 2006
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (734) 475-2945
- Medicaid ID
- 4257684 MI
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 5,735 in Michigan → Look up another NPI →
Also registered at 1620 Commerce Park Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Diane Marie Howlin in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMichigan Board of Medicine (LARA)
Search for license 4301052421Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
99% fewer Medicare Part D claims than the average internal medicine physician in 2024
16 Medicare Part D claims, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
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.
Diane Marie Howlin among 5,735 internal medicine physician records in Michigan
Diane Marie Howlin, M.D. is one of 5,735 internal medicine physician records with a practice address in Michigan. 79% 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 10% of them.
- NPI issued2006 · 10% of these records are older, 60% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 62% of these records are
- Record last updated2007 · 54% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Michigan practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
8 internal medicine physician records list a practice address in Chelsea
They are 8 of the 500 NPPES records with a practice address in Chelsea, and 5,735 internal medicine physician records in Michigan.
All 5,735 in Michigan → Every provider in Chelsea → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Shan Ansari, M.D.Chelsea, MI 481181720108152
- Sarah BurChelsea, MI 481181063730190
- Mark Grenquist, DOChelsea, MI 481181942300454
- Lynn Kriengkrairut, MDChelsea, MI 481181013595750
- Rebecca Patrias, MDChelsea, MI 481181760594899
- Rubens Ribeiro, M.D.Chelsea, MI 481181396935367
- Steven Yarows, MDChelsea, MI 481181275532087
- Tracey Alperin, MDBrighton, MI 481161609227958
Common questions
What is Diane Marie Howlin, M.D.'s NPI number?
Diane Marie Howlin, M.D.'s National Provider Identifier (NPI) is 1417964552, issued on Aug 2, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Diane Marie Howlin, M.D. located?
The NPPES record lists a practice address at 1620 Commerce Park Dr, Chelsea, MI, 48118. Phone: (734) 475-2921. Providers update this record themselves, so call before visiting.
How can I verify Diane Marie Howlin, M.D.'s license?
NPPES lists Michigan license number 4301052421, 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 Diane Marie Howlin, M.D. prescribe under Medicare Part D?
In 2024, Diane Marie Howlin, M.D. had 16 Medicare Part D claims; the average among internal medicine physician prescribers was 3,176. 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.