Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Stephen Gary Mlawsky, M.D.
Surgery Physician in Larkspur, CA · enumerated 2023.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1558044289
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Registry record
Entity type Individual (Type 1)
Name Stephen Gary Mlawsky
Credential M.D.
Sex Male
Practice address 228 Old Quarry Rd N, Larkspur, CA, 94939
Phone (916) 849-6178
Enumeration date Aug 9, 2023
Last updated in NPPES Aug 9, 2023
Taxonomy & licenses
207Q00000X Family Medicine Physician Allopathic & Osteopathic Physicians · License G56467 (CA) Secondary
208D00000X General Practice Physician Allopathic & Osteopathic Physicians · License G56467 (CA) Secondary
MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure.
About the MD credential
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 NPI 1558044289 active?
Yes, as of the latest NPPES snapshot, NPI 1558044289 is active (record last updated 2023-08-09).
How do I verify Stephen Mlawsky's NPI record?
Cross-check NPI 1558044289 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-08-09.