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

CLARK O. PARRISH M.D.
NPI 1891791232
Internal Medicine in Bellingham, WA

Active since June 21, 2005PECOS Enrolled
4545 CORDATA PKWY, BELLINGHAM, WA 98226(360) 738-2200(360) 715-2486 Get Directions Write a Review

NPPES record last updated: March 29, 2019. Verified against the NPPES registry weekly; last sync: October 25, 2026.

About Clark O. Parrish M.d. NPPES

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

CLARK O. PARRISH M.D. (NPI 1891791232) is an individual internal medicine provider in Bellingham, Washington, licensed in Washington (MD00024849) and active in the NPI registry since June 2005. He is enrolled in Medicare PECOS and maintains 3 additional practice locations.

NPPES Registry Identity

NPI1891791232
Entity TypeIndividualMale
Primary Taxonomy207R00000X
Provider Legal NameCLARK O. PARRISHCredential: M.D.
Location Address4545 CORDATA PKWYBellingham, WA 98226-7123
Mailing AddressPo Box 5096Bellingham, WA 98227-5096 · (360) 738-2200 · Fax (360) 715-2486
Phone(360) 738-2200
Fax(360) 715-2486
Sole ProprietorNo
Enumeration DateJune 21, 2005
Last NPPES UpdateMarch 29, 2019
✔ NPI 1891791232 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
Licenses✔ Licensed in WA · MD00024849✔ Licensed in OR · MD188136
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.
4545 CORDATA PKWY, Bellingham, WA 98226
Open in Google Maps ↗

Secondary Practice Locations 3

Location 1390 9th StFlorence, OR 97439-9470 · Phone (541) 997-7134 · Fax (541) 902-1319
Location 21990 Hospital Dr Ste 200Sedro Woolley, WA 98284-9315 · Phone (360) 856-8810 · Fax (360) 714-2520
Location 31117 Spring StFriday Harbor, WA 98250-9782 · Phone (360) 378-2141 · Fax (360) 378-1785

Other Identifiers 5

Medicaid1891791232WA
Medicaid1032549WA
Other12304WA · Regence
Other0230044WA · L&i And Crime Victims
Other4587184WA · Aetna

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Clark O. Parrish 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 Clark Parrish reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

South Sound Inpatient Physicians, PLLC
42 mi
Hospitalist
101 N MAIN ST
Coupeville, WA 98239
  • Reassigned Medicare billing, Washington enrollment
  • 915 clinicians in this Medicare group
NPI 1982035754 (360) 678-5151

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

Areas of Expertise CMS Part B claims

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213
This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.
97 services96 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 98226 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.

MELANIE R HARTLEY ARNP
Nurse Practitioner (Pediatrics, Critical Care)
4545 CORDATA PKWY, SUITE 1E
BELLINGHAM, WA 98226
Whatcom County (360) 738-2200
LESLIE HOUCK M.D.
Obstetrics & Gynecology (Gynecology)
4545 CORDATA PKWY
BELLINGHAM, WA 98226
Whatcom County (360) 738-2200
MADRONA MEDICAL GROUP,PS
Clinic/Center (Radiology)
4545 CORDATA PKWY
BELLINGHAM, WA 98226
Whatcom County (360) 738-2200
JOAN MARY CERVISI ARNP
Nurse Practitioner (Pediatrics)
4545 CORDATA PKWY
BELLINGHAM, WA 98226
Whatcom County (360) 738-2200
DR. SUKHJIT SINGH SHERGILL
Internal Medicine
4545 CORDATA PKWY, SUITE 2B
BELLINGHAM, WA 98226
Whatcom County (360) 738-2200
DIANA GUZA-WELLS M.D.
Internal Medicine
4545 CORDATA PKWY
BELLINGHAM, WA 98226
Whatcom County (360) 738-2200
RADU IVAN ARNP
Nurse Practitioner (Adult Health)
4545 CORDATA PKWY, SUITE 2A & 2B
BELLINGHAM, WA 98226
Whatcom County (360) 738-2200
DIANNE C. FOSTER ARNP
Nurse Practitioner (Obstetrics & Gynecology)
4545 CORDATA PKWY
BELLINGHAM, WA 98226
Whatcom County (360) 738-2200

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 Clark Parrish's NPI number?

The NPI number for Clark Parrish is 1891791232. It was assigned to this individual provider in the NPPES registry on June 21, 2005.

Where is Clark Parrish located?

Clark Parrish practices at 4545 Cordata Pkwy, Bellingham, WA 98226. The listed phone number is (360) 738-2200.

What is Clark Parrish's specialty?

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

Is Clark Parrish enrolled in Medicare?

Yes. Clark Parrish is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Clark Parrish's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Clark Parrish reassigns Medicare benefits to South Sound Inpatient Physicians, PLLC (Coupeville, 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 Clark Parrish'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 Clark Parrish was last updated on March 29, 2019. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 7 years 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.