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

Mr. Po Karczewski, ARNP

Psychiatric/Mental Health Nurse Practitioner in Lakewood, WA · enumerated 2007.

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

National Provider Identifier

1700932050

Verified

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Registry record

Entity type Individual (Type 1)

Name Mr. Po Karczewski

Credential ARNP

Sex Male

Practice address Lakewood, WA, 98499

Phone (253) 620-5191

Fax (253) 581-2540

Enumeration date Jan 26, 2007

Last updated in NPPES Jul 9, 2007

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

Taxonomy & licenses

363LP0808X Psychiatric/Mental Health Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License AP30005450 (WA) Primary

Other identifiers

Identifier	Type	State	Issuer
9630849	Medicaid	WA	-

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

What specialty is Po Karczewski?

Po Karczewski is registered in NPPES with the primary taxonomy of Psychiatric/Mental Health Nurse Practitioner. 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.

Other providers at this practice address

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Greater Lakes Mental Health Foundation Inc Mental Illness Community Based Residential Treatment Facility · Lakewood, WA NPI 1225039811 Russell Hicks Psychiatry Physician · Lakewood, WA NPI 1215905302 Angela Goode-Taylor Registered Nurse · Lakewood, WA NPI 1891844742 Cynthia Potts Mental Health Counselor · Lakewood, WA NPI 1124169842 Hannah Antokol Mental Health Counselor · Lakewood, WA NPI 1295863785 Carolyn Cyr Mental Health Counselor · Lakewood, WA NPI 1811027725 Amy Calkins-Kassler Clinical Social Worker · Lakewood, WA NPI 1407988470 Laura Rambo Mental Health Counselor · Lakewood, WA NPI 1316062664

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-09.