William Donald Clark, D.O.
Family Medicine Physician · Rockford, MI
William Donald Clark, D.O. is a family medicine physician with a practice address in Rockford, Michigan, and NPI 1184987711, issued on Jun 19, 2012. Check the license (Michigan 5101020020, as entered in NPPES) on the Michigan Board of Medicine (LARA); the Medicare figures below come from public CMS files.
- Name
- William Donald Clark
- Credential
- D.O.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 5101020020 MI
Self-reported in NPPES; status is on the state search - Practice location
- 8501 Meadow Crk, Rockford, MI 49341
- Phone
- (616) 267-7884
- Enumerated
- Jun 19, 2012
- Record last updated
- Jan 3, 2024
- Medicare enrollment
- Enrolled (PECOS I20150609001557); accepts Medicare assignment
- Medical or professional school
- Michigan State University College Of Osteopathic Medicine, 2012
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 6,013 in Michigan → Look up another NPI →
Also registered at 8501 Meadow Crk
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Brent Becklin, M.D.Pediatrics Physician1700070067
- Matthew Bottke, DOFamily Medicine Physician1982086302
Verify William Donald Clark in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMichigan Board of Medicine (LARA)
Search for license 5101020020Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
13% fewer Medicare Part D claims than the average family medicine physician in 2024
3,100 Medicare Part D claims for 350 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 12% of claims. 52 claims were for opioids.
Most prescribed
- Atorvastatin Calcium333 claims
- Lisinopril147 claims
- Rosuvastatin Calcium132 claims
- Levothyroxine Sodium130 claims
- Omeprazole102 claims
- Metoprolol Succinate94 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 2 group practices
- Spectrum Health Primary Care PartnersGrand Rapids, MI
- Spectrum Health UnitedGreenville, MI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
William Donald Clark among 6,013 family medicine physician records in Michigan
William Donald Clark, D.O. is one of 6,013 family medicine physician records with a practice address in Michigan. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2012, is newer than 61% of them.
- NPI issued2012 · 61% of these records are older, 37% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 58% of these records are
- Graduated2012 · median 2008 among the 3,493 with a school on file
- Record last updated2024 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a Michigan practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
21 family medicine physician records list a practice address in Rockford
They are 21 of the 493 NPPES records with a practice address in Rockford, and 6,013 family medicine physician records in Michigan.
All 6,013 in Michigan → Every provider in Rockford → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Daniel Cunningham, D.O.Rockford, MI 493411205890605
- Aaron Defrang, DORockford, MI 493411689886608
- Gerald Durfee, MDRockford, MI 493411821040858
- Shannon Fritz, D.O.Rockford, MI 493411952641060
- William Granger, M.D.Rockford, MI 493411689982159
- Marc Helzer, M.D.Rockford, MI 493411144249053
- Joshua Koenig, D.O.Rockford, MI 493411275828683
- Derek Lanier, MD MPHRockford, MI 493411417139130
Common questions
What is William Donald Clark, D.O.'s NPI number?
William Donald Clark, D.O.'s National Provider Identifier (NPI) is 1184987711, issued on Jun 19, 2012. An NPI identifies a provider in billing; it is not a license.
Where is William Donald Clark, D.O. located?
The NPPES record lists a practice address at 8501 Meadow Crk, Rockford, MI, 49341. Phone: (616) 267-7884. Providers update this record themselves, so call before visiting.
How can I verify William Donald Clark, D.O.'s license?
NPPES lists Michigan license number 5101020020, 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 William Donald Clark, D.O. prescribe under Medicare Part D?
In 2024, William Donald Clark, D.O. had 3,100 Medicare Part D claims for 350 beneficiaries; the average among family medicine physician prescribers was 3,544. 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.