NPI Portal NPI Lookup & Verification

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

Dr. Mark C. Walker I, M.D

Psychiatry Physician in Palm Beach, FL · enumerated 2012 · practices at Mcw Psych Care MD, LLC.

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

National Provider Identifier

1427318864

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)
Name Dr. Mark C. Walker I
Credential M.D
Sex Male
Practice address Palm Beach, FL, 33480
Phone (352) 497-5920
Fax (561) 629-5240
Enumeration date May 19, 2012
Last updated in NPPES Jun 21, 2025

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

Taxonomy & licenses

2084P0800X Psychiatry Physician Allopathic & Osteopathic Physicians · License ME108732 (FL) 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
100556600 Medicaid FL -

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

What is the NPI number for Mark Walker?
The National Provider Identifier (NPI) for Mark Walker is 1427318864, a Type 1 (individual) record in the CMS NPPES registry.
Where does Mark Walker practice?
The practice location on file with NPPES is in Palm Beach, FL. Providers can have multiple locations; NPPES lists the primary practice address.

Other providers at this practice address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-06-21.