Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Douglas R Diemer, PA-C
Physician Assistant in Portage, MI · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1518037878
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Registry record
Entity type Individual (Type 1)
Name Douglas R Diemer
Credential PA-C
Sex Male
Practice address 3200 W Centre Ave, Suite 203, Portage, MI, 49024
Phone (269) 324-0799
Fax (269) 324-8013
Enumeration date Nov 8, 2006
Last updated in NPPES Aug 30, 2022
Taxonomy & licenses
363A00000X Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License 5601004477 (MI) Primary
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 1151100074 | Other | MI | BCBS |
| 4179846 | Medicaid | MI | - |
| 2953900670 | Other | MI | BLUE CROSS BLUE SHIELD |
| 4173074 | Medicaid | MI | - |
What is an NPI number?
A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.
Frequently asked questions
What specialty is Douglas Diemer?
Douglas Diemer is registered in NPPES with the primary taxonomy of Physician Assistant. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.
Is this the official NPI registry?
No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.
Other providers at this practice address
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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-08-30.