Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Mark Krel, D.O.

Neurological Surgery Physician in Palo Alto, CA · enumerated 2014.

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

National Provider Identifier

1326450685

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Registry record

Entity type Individual (Type 1)

Name Dr. Mark Krel

Credential D.O.

Sex Male

Practice address 213 Quarry Rd, Palo Alto, CA, 94304

Phone (818) 421-0130

Enumeration date May 21, 2014

Last updated in NPPES May 26, 2021

Taxonomy & licenses

207T00000X Neurological Surgery Physician Allopathic & Osteopathic Physicians · License 20A14234 (CA) Primary

DO · Doctor of Osteopathic Medicine: A fully licensed physician trained in osteopathic medical schools, with the same practice rights as an MD. About the DO 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.

Read the full guide → Validate an NPI →

Frequently asked questions

Is NPI 1326450685 active?

Yes, as of the latest NPPES snapshot, NPI 1326450685 is active (record last updated 2021-05-26).

How do I verify Mark Krel's NPI record?

Cross-check NPI 1326450685 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 2021-05-26.