John Diddams, M.D.
Otolaryngology Physician · Marquette, MI
John Diddams, M.D. is an otolaryngology physician with a practice address in Marquette, Michigan, and NPI 1720390941, issued on Jul 2, 2010. Check the license (Michigan 4301032322, as entered in NPPES) on the Michigan Board of Medicine (LARA); the federal record below is the public data PlainDoctor holds for this provider.
- Name
- John Diddams
- Credential
- M.D.
- Primary taxonomy
- Otolaryngology Physician 207Y00000X
- License number
- 4301032322 MI
Self-reported in NPPES; status is on the state search - Practice location
- 425 E Michigan St, Marquette, MI 49855
- Phone
- (906) 228-6589
- Enumerated
- Jul 2, 2010
- Record last updated
- Jul 2, 2010 (not updated in 16 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest otolaryngology physician records → All 307 in Michigan → Look up another NPI →
Verify John Diddams in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMichigan Board of Medicine (LARA)
Search for license 4301032322Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
John Diddams among 307 otolaryngology physician records in Michigan
John Diddams, M.D. is one of 307 otolaryngology physician records with a practice address in Michigan. 78% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2010, is newer than 61% of them.
- NPI issued2010 · 61% of these records are older, 35% newer
- In a Medicare fileNo · 78% of these records are
- In the CMS Doctors and Clinicians fileNo · 65% of these records are
- Record last updated2010 · 56% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Y00000X and a Michigan practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Otolaryngology Physician providers in Michigan
There are 307 otolaryngology physician records in Michigan. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 307 in Michigan → Every provider in Marquette → Otolaryngology Physician nationwide →
The 8 otolaryngology physician records with the nearest ZIP codes
- David Heichel, M.D.Marquette, MI 498551629010343
- Philip Heichel, M.D.Marquette, MI 498551790132504
- Thomas Carlson, MDEscanaba, MI 498291699732834
- John Klim, DOEscanaba, MI 498291174588164
- Ray Cameron, MD, PHDIron Mountain, MI 498011578530564
- James Harrison, MDIron Mountain, MI 498011932143526
- Howard Beck, M.D.Petoskey, MI 497701710906425
- Henry Singer, M.D.Petoskey, MI 497701497091078
Common questions
What is John Diddams, M.D.'s NPI number?
John Diddams, M.D.'s National Provider Identifier (NPI) is 1720390941, issued on Jul 2, 2010. An NPI identifies a provider in billing; it is not a license.
Where is John Diddams, M.D. located?
The NPPES record lists a practice address at 425 E Michigan St, Marquette, MI, 49855. Phone: (906) 228-6589. Providers update this record themselves, so call before visiting.
How can I verify John Diddams, M.D.'s license?
NPPES lists Michigan license number 4301032322, 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.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. 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.