Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Mark Andrew Chylinski, MD

Internal Medicine Physician in California, MD · enumerated 2017.

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

National Provider Identifier

1710408539

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Registry record

Entity type Individual (Type 1)

Name Dr. Mark Andrew Chylinski

Credential MD

Sex Male

Practice address 22590 Shady Ct, California, MD, 20619

Phone (301) 373-7900

Fax (301) 373-6900

Enumeration date Jul 1, 2017

Last updated in NPPES May 16, 2022

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License D91250 (MD) Secondary

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License D0091250 (MD) 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
578017900	Medicaid	MD	-

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 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 Mark Chylinski?

Mark Chylinski is registered in NPPES with the primary taxonomy of Internal Medicine Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-05-16.