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Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mark E Ritter, M.D.

Internal Medicine Physician in Chesterton, IN · enumerated 2006 · practices at Premise Health of Indiana Medical, P.C..

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1609939511

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Registry record

Entity type Individual (Type 1)
Name Mark E Ritter
Credential M.D.
Sex Male
Practice address 2022 Kelle Dr, Chesterton, IN, 46304
Phone (219) 395-2200
Fax (219) 983-1837
Enumeration date Dec 19, 2006
Last updated in NPPES Sep 14, 2020

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 01037402A (IN) Primary
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
110219045 Other IN RAILROAD PROVIDER NUMBER
000000203749 Other IN PROVIDER BCBS NUMBER

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.

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Frequently asked questions

Is NPI 1609939511 active?
Yes, as of the latest NPPES snapshot, NPI 1609939511 is active (record last updated 2020-09-14).
How do I verify Mark Ritter's NPI record?
Cross-check NPI 1609939511 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-09-14.