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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

KARSTIN MARIA ALFARO PA-C
NPI 1861257982
Physician Assistant in Seattle, WA

Active since February 19, 2024PECOS Enrolled
825 EASTLAKE AVE E, SEATTLE, WA 98109(206) 520-5000 Get Directions Write a Review

NPPES record last updated: September 30, 2026. Verified against the NPPES registry weekly; last sync: October 04, 2026.

Record update history: Sep 30, 2026, Nov 28, 2025 (2 updates tracked since 2025).

About Karstin Maria Alfaro Pa-c NPPES

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

KARSTIN MARIA ALFARO PA-C (NPI 1861257982) is an individual physician assistant in Seattle, Washington, licensed in Washington (PA.PA.70168046) and active in the NPI registry since February 2024. She is enrolled in Medicare PECOS and maintains a secondary practice location in Seattle.

NPPES Registry Identity

NPI1861257982
Entity TypeIndividualFemale
Primary Taxonomy363A00000X
Provider Legal NameKARSTIN MARIA ALFAROCredential: PA-C
Location Address825 EASTLAKE AVE ESeattle, WA 98109-4405
Mailing AddressPo Box 50095Seattle, WA 98145-5095
Phone(206) 520-5000
Sole ProprietorNo
Enumeration DateFebruary 19, 2024
Last NPPES UpdateSeptember 30, 20262 updates tracked since enumeration
NPPES CertifiedSeptember 30, 2026
✔ NPI 1861257982 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyPhysician AssistantPhysician Assistants & Advanced Practice Nursing Providers
Taxonomy Code363A00000X
License✔ Licensed in WA · PA.PA.70168046
Definition
A physician assistant is a person who has successfully completed an accredited education program for physician assistant, is licensed by the state and is practicing within the scope of that license. Physician assistants are formally trained to perform many of the routine, time-consuming tasks a physician can do. In some states, they may prescribe medications. They take medical histories, perform physical exams, order lab tests and x-rays, and give inoculations. Most states require that they work under the supervision of a physician.
Also ListedPhysician Assistant · MedicalTaxonomy 363AM0700X · License PA.PA.70168046 (WA)
825 EASTLAKE AVE E, Seattle, WA 98109
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Secondary Practice Location 1

Location 11959 NE Pacific StSeattle, WA 98195-0001 · Phone (206) 520-5000

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Karstin Maria Alfaro Pa-c 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.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 98109 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
$97.43 typical visit price
range $63.67 – $189.37
Typical copayment $24.35 (range $15.91 – $47.34)
Most-billed visit code 99203
Established Patient
$78.74 typical visit price
range $21.12 – $155.00
Typical copayment $19.68 (range $5.28 – $38.75)
Most-billed visit code 99213
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.

SANDHYA RAMANATHAN PANCH M.D.
Internal Medicine (Hematology)
825 EASTLAKE AVE E
SEATTLE, WA 98109
King County (206) 520-5000
AFSHIN SHAMELI MD, PHD
Pathology (Anatomic Pathology & Clinical Pathology)
825 EASTLAKE AVE E
SEATTLE, WA 98109
King County (206) 520-5000
MELISSA YEN-CHING LO DNP, ARNP
Nurse Practitioner (Pediatrics)
825 EASTLAKE AVE E
SEATTLE, WA 98109
King County (206) 861-3396
VYSHAK ALVA VENUR M.D
Internal Medicine (Medical Oncology)
825 EASTLAKE AVE E
SEATTLE, WA 98109
King County (206) 520-5700
COURTNEY JO SANDERSON
Physician Assistant
825 EASTLAKE AVE E
SEATTLE, WA 98109
King County (206) 288-1000
DR. EMILY NORPELL PALMQUIST M.D.
Surgery
825 EASTLAKE AVE E
SEATTLE, WA 98109
King County (206) 520-5000
KAITLIN ELIZABETH VERNI
Physician Assistant
825 EASTLAKE AVE E
SEATTLE, WA 98109
King County (206) 288-1000
MIKHAILA CICELY MARECKI ARNP
Nurse Practitioner (Women's Health)
825 EASTLAKE AVE E
SEATTLE, WA 98109
King County (206) 520-5000

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 Karstin Alfaro's NPI number?

The NPI number for Karstin Alfaro is 1861257982. It was assigned to this individual provider in the NPPES registry on February 19, 2024.

Where is Karstin Alfaro located?

Karstin Alfaro practices at 825 Eastlake Ave E, Seattle, WA 98109. The listed phone number is (206) 520-5000.

What is Karstin Alfaro's specialty?

The primary specialty registered for this NPI is Physician Assistant with taxonomy code 363A00000X.

Is Karstin Alfaro enrolled in Medicare?

Yes. Karstin Alfaro is registered in the Medicare PECOS enrollment system.

When was this NPI record last updated?

The NPPES record for Karstin Alfaro was last updated on September 30, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 10 days 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.