Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Marcus Blass, MD
Surgery Physician in Allegan, MI · enumerated 2005.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1558342725
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Registry record
Entity type Individual (Type 1)
Name Marcus Blass
Credential MD
Sex Male
Practice address 551 Linn St, Allegan, MI, 49010
Phone (269) 686-5850
Fax (269) 686-5897
Enumeration date Nov 7, 2005
Last updated in NPPES Nov 16, 2007
Taxonomy & licenses
MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure.
About the MD credential
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 17-30505 | Other | MI | PHP PROVIDER # |
| 1833840 | Other | MI | UNITED HEALTHCARE |
| 21926 | Other | MI | HEALTH PLAN OF MI |
| MB036710 | Other | MI | STATE LICENSE # |
| 0200302138 | Other | MI | BCBS MI PROVIDER # |
| 2309 | Other | MI | COMMUNITY CHOICE MI |
| P52808 | Other | MI | BLUE CARE NETWORK PROV # |
| 2632169 | 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
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.
What specialty is Marcus Blass?
Marcus Blass is registered in NPPES with the primary taxonomy of Surgery Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.
Other providers at this practice address
Browse all → Louis Praamsma Family Medicine Physician · Allegan, MI NPI 1720081458 Brenda Schloff Family Medicine Physician · Allegan, MI NPI 1295733061 Patricia Seiler Family Medicine Physician · Allegan, MI NPI 1366434177 Allegan Medical Clinic, P.C. Multi-Specialty Clinic/Center · Allegan, MI NPI 1215928155 James Wheat Family Medicine Physician · Allegan, MI NPI 1710978028 John Mulder Physician Assistant · Allegan, MI NPI 1053302364 Peter Savage Family Medicine Physician · Allegan, MI NPI 1255322541 John Walstrum Family Medicine Physician · Allegan, MI NPI 1679564975
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-11-16.