Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mr. Mark Wsevolod Isajiw, L.C.S.W.

Mental Health Counselor in Apo, AE · enumerated 2005.

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

National Provider Identifier

1437140092

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Registry record

Entity type Individual (Type 1)

Name Mr. Mark Wsevolod Isajiw

Credential L.C.S.W.

Sex Male

Practice address Unit 6180, Box 245, Apo, AE, 09604

Phone (043) 430-5321

Fax (043) 430-5668

Enumeration date Nov 2, 2005

Last updated in NPPES Jul 13, 2026

Taxonomy & licenses

101YM0800X Mental Health Counselor Behavioral Health & Social Service Providers · License LW00004144 (WA) Primary

LCSW · Licensed Clinical Social Worker: A social worker licensed for clinical practice including mental-health therapy. About the LCSW 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

What specialty is Mark Isajiw?

Mark Isajiw is registered in NPPES with the primary taxonomy of Mental Health Counselor. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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.

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Nicole Richardson Pediatric Occupational Therapist · Apo, AE NPI 1487643532 Travis Adams Clinical Psychologist · Apo, AE NPI 1336138551 Gordon Peters Aerospace Medicine Physician · Apo, AE NPI 1538141320 Robert Delo Oral and Maxillofacial Surgery (Dentist) · Apo, AE NPI 1366521312 Courtney Merseal Sports Medicine (Internal Medicine) Physician · Apo, AE NPI 1396087771 Christie Simpson-Mckenzie Clinical Psychologist · Apo, AE NPI 1477979334 Connor Moos Dentist · Apo, AE NPI 1306636048 Joelle-Delrose Ortega Dentist · Apo, AE NPI 1831084482

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