1. Home
  2. Directory
  3. Washington
  4. Vancouver
  5. Internal Medicine
  6. NPI Profile

DR. DEXTER JAMES DE GUZMAN ASUNCION M.D.
NPI 1326256975
Internal Medicine in Vancouver, WA

Active since May 18, 2007PECOS Enrolled
1601 E FOURTH PLAIN BLVD, VANCOUVER, WA 98661(360) 905-1749(360) 690-0343 Get Directions Write a Review

NPPES record last updated: March 3, 2026. Verified against the NPPES registry weekly; last sync: November 01, 2026.

About Dr. Dexter James De Guzman Asuncion M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. DEXTER JAMES DE GUZMAN ASUNCION M.D. (NPI 1326256975) is an individual internal medicine provider in Vancouver, Washington, licensed in Washington (MD60070549) and active in the NPI registry since May 2007. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1326256975
Entity TypeIndividualMale
Primary Taxonomy207R00000X
Provider Legal NameDR. DEXTER JAMES DE GUZMAN ASUNCIONCredential: M.D.
Location Address1601 E FOURTH PLAIN BLVDVancouver, WA 98661-3713
Mailing Address1601 E Fourth Plain BlvdVancouver, WA 98661-3713 · (360) 905-1749 · Fax (360) 690-0343
Phone(360) 905-1749
Fax(360) 690-0343
Sole ProprietorNo
Enumeration DateMay 18, 2007
Last NPPES UpdateMarch 3, 2026
NPPES CertifiedMarch 3, 2026
✔ NPI 1326256975 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License✔ Licensed in WA · MD60070549
Definition
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
1601 E FOURTH PLAIN BLVD, Vancouver, WA 98661
Open in Google Maps ↗

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Dexter James De Guzman Asuncion M.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignment

Medicare enrollment records show Dexter James Asuncion reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Manor Care Of Salmon Creek Wa, Association
5.7 mi
Skilled Nursing Facility
2811 NE 139TH ST
Vancouver, WA 98686
  • Reassigned Medicare billing, Washington enrollment
  • Medicare enrollment name: Kaiser Foundation Health Plan Of The Northwest
  • 2,534 clinicians in this Medicare group
NPI 1609171081 (360) 574-5247

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 98661 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$130.99 typical visit price
range $57.27 – $172.80
Typical copayment $32.74 (range $14.31 – $43.20)
Most-billed visit code 99204
Established Patient
$100.78 typical visit price
range $18.56 – $141.11
Typical copayment $25.19 (range $4.64 – $35.27)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

OXSANA V STENERSEN MSW
Counselor
1601 E FOURTH PLAIN BLVD
VANCOUVER, WA 98661
Clark County (360) 397-8246
ANTONIA M MUELLER L.P.C., R.C.
Counselor (Mental Health)
1601 E FOURTH PLAIN BLVD, BLDG 17, STE B222
VANCOUVER, WA 98661
Clark County (360) 397-8484
JACOB LEE HAMMOND CMHC
Counselor (Mental Health)
1601 E FOURTH PLAIN BLVD
VANCOUVER, WA 98661
Clark County (360) 397-8246
MARRY-KATE LINDSEY SUDPT
Counselor (Addiction (Substance Use Disorder))
1601 E FOURTH PLAIN BLVD
VANCOUVER, WA 98661
Clark County (360) 397-8246
KATHLEEN MARIE HANSON D.M.D.
Dentist (General Practice)
1601 E FOURTH PLAIN BLVD, V3 DENT
VANCOUVER, WA 98661
Clark County (360) 619-5990
KATHKEEN ALICIA DIAMOND PH.D.
Counselor (Mental Health)
1601 E FOURTH PLAIN BLVD
VANCOUVER, WA 98661
Clark County (360) 397-8246
KIMBERLI CECIL
Social Worker
1601 E FOURTH PLAIN BLVD
VANCOUVER, WA 98661
Clark County (360) 696-4061
DR. GEORGE C LEE PHARM.D.
Pharmacist (Pharmacotherapy)
1601 E FOURTH PLAIN BLVD
VANCOUVER, WA 98661
Clark County (360) 696-4061

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Dexter James Asuncion's NPI number?

The NPI number for Dexter James Asuncion is 1326256975. It was assigned to this individual provider in the NPPES registry on May 18, 2007.

Where is Dexter James Asuncion located?

Dexter James Asuncion practices at 1601 E Fourth Plain Blvd, Vancouver, WA 98661. The listed phone number is (360) 905-1749.

What is Dexter James Asuncion's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Is Dexter James Asuncion enrolled in Medicare?

Yes. Dexter James Asuncion is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Dexter James Asuncion's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Dexter James Asuncion reassigns Medicare benefits to Manor Care Of Salmon Creek Wa, Association (Vancouver, WA). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Dexter James Asuncion's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Dexter James Asuncion was last updated on March 3, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 8 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.