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Healthcare Providers & Facilities in Mercer Island, WA

Public healthcare directory of 333 individual practitioners and 122 healthcare facilities located in Mercer Island, Washington.

333 Practitioners
122 Facilities
85 Specialties

Medical Specialties in Mercer Island

Select a specialty to view practitioner listings, practice locations, and qualifications.

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All Specialties in Mercer Island

Specialties with enough public records for a comparison with U.S. figures, besides those named above, plus the 60 largest of 81 more with at least one listed practitioner. Number of practitioners in brackets.

Chiropractic Providers

Dietary & Nutritional Service Providers

Eye and Vision Services Providers

Nursing Service Providers

Nursing Service Related Providers

Other Service Providers

Pharmacy Service Providers

Respiratory, Developmental, Rehabilitative and Restorative Service Providers

Speech, Language and Hearing Service Providers

Featured Healthcare Providers in Mercer Island

Practitioner profiles in Mercer Island, WA with recent CMS Medicare or Open Payments data.

Jennifer Hall , PA-C

Physician Assistant - Medical

Medicare Accepted
8435 Se 68th St Ste 118, Mercer Island, WA
Phone: 2062327546
NPI 1598753675

Dr. Scott Fannin , DO

Family Medicine

3003 Island Crest Way, Mercer Island, WA
Phone: 2062753487
NPI 1467547760

Dr. Katrina Spaunhurst , MD

Dermatology

Medicare Accepted
7707 Se 27th St Ste 104, Mercer Island, WA
Phone: 2062322267
NPI 1679917116

Dr. Theodore Mandelkorn , MD

Pediatrics - Developmental - Behavioral Pediatrics

2553 76th Ave Se, Mercer Island, WA
Phone: 2062750702
NPI 1922167220

Dr. Mary Bartels , MD

Psychiatry & Neurology - Psychiatry

7254 91st Ave Se, Mercer Island, WA
Phone: 2066799084
NPI 1609925700

Dr. Lia Buzzell , PT, DPT

Physical Therapist

Medicare Accepted
7900 Se 28th St Ste 102, Mercer Island, WA
Phone: 2062329045
NPI 1174295521

Largest Cities in Washington

Other Washington cities with a full directory, by the number of active practitioners listed in NPPES.

How Mercer Island compares with the U.S.

Compared with the U.S. as a whole, Mercer Island has more Physical Therapists (1.8x) and clinicians in Dentist - General Practice (1.3x) per 100,000 residents.

Mercer Island has 1,316 active clinicians per 100,000 residents, compared with 2,198 for the U.S.

What these numbers mean

Clinicians per 100,000 residents compares places of different sizes. We count active clinicians who list a practice address in the area in the federal NPI registry (NPPES) and divide by the number of people who live there, according to the U.S. Census Bureau. The U.S. rate is the same calculation for the whole country.

A higher number does not mean it is easier to get an appointment, that wait times are shorter, or that care is better. It also does not show how many clinicians are accepting new patients or which insurance plans they take. A lower number does not by itself mean there is a shortage.

City counts use the city name in each clinician's practice address. That postal city can cover a larger or smaller area than the city limits the Census Bureau uses for population, and many clinicians list only one address even if they work in several places. Cities with hospitals or large medical centers often list more specialists than the number of residents alone would suggest, because patients also come from nearby areas.

87% of clinicians in Mercer Island listed in the CMS Medicare file (54 of 62) accept Medicare assignment. That is lower than the Washington share of 94%.

Only 62 of 333 active clinicians in Mercer Island appear in the CMS Medicare file, so this share describes that smaller group.

What is Medicare assignment?

A clinician who accepts Medicare assignment agrees to take the Medicare-approved amount as full payment for services that Original Medicare covers. You usually still pay your deductible and coinsurance. This comes from the CMS Doctors and Clinicians file and applies to Original Medicare only. Medicare Advantage plans have their own provider networks. It does not show whether a clinician is taking new patients.

Some clinicians are listed as "may accept assignment," which means they can decide case by case. Clinicians without an assignment flag, or who are not in the CMS file, are not counted as accepting assignment. That does not mean they refuse Medicare. Ask the office before your visit.

27% of clinicians in Mercer Island listed in the CMS Medicare file (17 of 62) have a CMS telehealth indicator, meaning their recent Medicare claims include telehealth services. That is similar to the Washington share of 24%.

About the telehealth indicator

The telehealth indicator comes from CMS. It marks clinicians whose recent paid Medicare claims include services delivered by telehealth. It means a clinician has provided some services by telehealth, not that every visit can be done online. A clinician without the indicator may still offer telehealth, for example to patients who are not on Medicare. Ask the office which visits can be done by video or phone.

These figures summarize public federal data. They do not measure quality of care, appointment availability, or whether a clinician accepts your insurance or new patients. Registry addresses can be out of date. Please confirm details directly with the office and your plan. This information is not medical advice.

Prepared by T-MedInfo from NPPES, CMS and U.S. Census Bureau data. Questions or corrections: support@true-medinfo.com ยท Methodology

Sources: Clinician counts and practice addresses: NPPES NPI Registry, Centers for Medicare & Medicaid Services (CMS), data as of August 2026. Medicare assignment and telehealth indicators: CMS Doctors and Clinicians National Downloadable File. Population: U.S. Census Bureau, American Community Survey 2020-2024 5-Year Estimates, Table B01003 (Total Population).

Mercer Island CMS Healthcare & Financial Disclosures

CMS Part D Prescribers (2024), Open Payments (program year 2025), Medicare (PECOS) enrollment and Part B (2024) data for Mercer Island, WA

Source: CMS public datasets

Healthcare operations in Mercer Island, WA encompass 333 active individual practitioners and 122 registered medical facilities across 85 clinical specialties.

According to CMS Medicare Part D analytics for 2024, prescription drug volume in Mercer Island accounts for $2.6 Million across 45,375 prescription claims. 99 local practitioners have a Medicare (PECOS) enrollment record. Open Payments data for program year 2025 list $0.1 Million in payments reported by companies to 43 local practitioners; a reported payment does not necessarily mean the financial relationship is improper.

Medicare Part D Prescriptions (2024) $2.6M 45,375 Prescription Claims Source: data.cms.gov
Open Payments Sunshine Act (2025) $0.1M 43 Recipients Disclosed A reported payment does not necessarily mean the financial relationship is improper. Source: openpaymentsdata.cms.gov
Medicare (PECOS) Enrollment 99 Enrolled Medicare Practitioners Source: data.cms.gov
Medicare Part B Allowed Volume (2024) $2.7M 50,505 Services Performed Source: data.cms.gov

CMS PECOS: Eligible to Order or Refer for Medicare in Mercer Island

Part B Lab & Imaging Eligible: 63
Durable Medical Equipment (DME): 70
Home Health Agency (HHA): 54
Source: CMS Order and Referring