NPI Portal NPI Lookup & Verification

Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Dr. Mark L Silverstein, MD

Internal Medicine Physician in Yakima, WA · enumerated 2006.

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

National Provider Identifier

1083683304

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Registry record

Entity type Individual (Type 1)
Name Dr. Mark L Silverstein
Credential MD
Sex Male
Practice address Yakima, WA, 98902
Phone (509) 575-5000
Enumeration date Mar 17, 2006
Last updated in NPPES Mar 12, 2020

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 60173784 (WA) 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
1083683304 Other VT BCBS
P00426191 Other VT RAIL ROAD MEDICARE
0VN1746 Medicaid VT -

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

How do I verify Mark Silverstein's NPI record?
Cross-check NPI 1083683304 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Is NPI 1083683304 active?
Yes, as of the latest NPPES snapshot, NPI 1083683304 is active (record last updated 2020-03-12).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-03-12.