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DR. NATHAN MERCER MD
NPI 1497255178
Hospitalist in Seattle, WA

Active since February 19, 2018PECOS EnrolledAccepts Medicare Assignment
925 SENECA ST, SEATTLE, WA 98101(206) 625-7373 Get Directions Write a Review

NPPES record last updated: August 7, 2025. Verified against the NPPES registry weekly; last sync: August 09, 2026.

Record update history: Aug 7, 2025, Oct 31, 2023, Jun 28, 2021 and 2 more (5 updates tracked since 2018).

About Dr. Nathan Mercer Md NPPES

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

DR. NATHAN MERCER MD (NPI 1497255178) is an individual hospitalist provider in Seattle, Washington, licensed in Washington (MD61552788) and active in the NPI registry since February 2018. He is enrolled in Medicare PECOS, is affiliated with Virginia Mason Medical Center, and maintains a secondary practice location in Joint Base Lewis Mcchord.

NPPES Registry Identity

NPI1497255178
Entity TypeIndividualMale
Primary Taxonomy208M00000X
Provider Legal NameDR. NATHAN MERCERCredential: MD
Location Address925 SENECA STSeattle, WA 98101-2742
Mailing AddressPo Box 741515Los Angeles, CA 90074-1515 · (206) 625-7373
Phone(206) 625-7373
Sole ProprietorNo
Medical School CMSUniversity Of Toledo College Of MedicineGraduated 2018
Enumeration DateFebruary 19, 2018
Last NPPES UpdateAugust 7, 20255 updates tracked since enumeration
NPPES CertifiedAugust 7, 2025
✔ NPI 1497255178 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyHospitalistAllopathic & Osteopathic Physicians
Taxonomy Code208M00000X
License✔ Licensed in WA · MD61552788
Definition
Hospitalists are physicians whose primary professional focus is the general medical care of hospitalized patients. Their activities include patient care, teaching, research, and leadership related to Hospital Medicine. The term 'hospitalist' refers to physicians whose practice emphasizes providing care for hospitalized patients.
Also ListedInternal MedicineTaxonomy 207R00000X · License 0101267697 (VA)
925 SENECA ST, Seattle, WA 98101
Open in Google Maps ↗

Secondary Practice Location 1

Location 19040 Jackson AveJoint Base Lewis McChord, WA 98431-0001 · Phone (253) 968-2462 · Fax (253) 968-2972

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Providence Health Plan.Insurance ›

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Nathan Mercer Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID2668804634
PECOS Enrollment IDI20250513000396
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.

Hospital Affiliations CMS Care Compare 4

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Virginia Mason Medical Center

Acute Care Hospitals · Seattle, WA
5/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number500005
Location925 Seneca StSeattle, WA 98101 · King County
Emergency services Birthing friendly

Grays Harbor Community Hospital

Acute Care Hospitals · Aberdeen, WA
2/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number500031
Location915 Anderson DriveAberdeen, WA 98520 · Grays Harbor County
Emergency services Birthing friendly

Harrison Medical Center

Acute Care Hospitals · Bremerton, WA
3/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number500039
Location2520 Cherry AvenueBremerton, WA 98310 · Kitsap County
Emergency services Birthing friendly

Kittitas Valley Community Hospital

Critical Access Hospitals · Ellensburg, WA
OwnershipGovernment - Hospital District or Authority
CMS Certification Number501333
Location603 South ChestnutEllensburg, WA 98926 · Kittitas County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 98101 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
$143.76 typical visit price
range $63.67 – $189.37
Typical copayment $35.94 (range $15.91 – $47.34)
Most-billed visit code 99204
Established Patient
$111.00 typical visit price
range $21.12 – $155.00
Typical copayment $27.75 (range $5.28 – $38.75)
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.

Referred Medical Equipment & Supplies CMS DME claims 2

Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.

Oxygen concentrator, single delivery port, capable of delivering 85 percent or greater oxygen concentration at the prescribed flow rate E1390
DME-Oxygen and Supplies · category DC002N
1 supplier11 claims11 services$57.05 avg. paid by Medicare
Supply allowance for therapeutic continuous glucose monitor (cgm), includes all supplies and accessories, 1 month supply = 1 unit of service K0553
DME-Other DME · category DE017N
1 supplier11 claims11 services$185.12 avg. paid by Medicare
Dollar amounts are the average Medicare paid the supplier per service. They are not the cost to the patient.

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.

STEPHEN A LOPEZ MD
Hospitalist
925 SENECA ST
SEATTLE, WA 98101
King County (206) 341-0860
DR. STEPHEN RAMON MD
Student in an Organized Health Care Education/Training Program
925 SENECA ST
SEATTLE, WA 98101
King County (206) 583-6079
JARED JOHN BASSMANN
Student in an Organized Health Care Education/Training Program
925 SENECA ST
SEATTLE, WA 98101
King County (206) 223-6772
YORDANOS T KAHSAI M.D.
Hospitalist
925 SENECA ST
SEATTLE, WA 98101
King County (206) 624-1144
RHADIKA MCCORMICK SOUZA MD
Emergency Medicine
925 SENECA ST
SEATTLE, WA 98101
King County (206) 583-6433
IRINA KUSHNIR M.D.
Hospitalist
925 SENECA ST
SEATTLE, WA 98101
King County (206) 341-1401
JENNA LEE MALIGRO MD
Student in an Organized Health Care Education/Training Program
925 SENECA ST, MAIL STOP: H8-GME
SEATTLE, WA 98101
King County (206) 583-6079
THOMAS HOY PEREZ
Student in an Organized Health Care Education/Training Program
925 SENECA ST
SEATTLE, WA 98101
King County (408) 832-4749

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 Nathan Mercer's NPI number?

The NPI number for Nathan Mercer is 1497255178. It was assigned to this individual provider in the NPPES registry on February 19, 2018.

Where is Nathan Mercer located?

Nathan Mercer practices at 925 Seneca St, Seattle, WA 98101. The listed phone number is (206) 625-7373.

What is Nathan Mercer's specialty?

The primary specialty registered for this NPI is Hospitalist with taxonomy code 208M00000X.

Is Nathan Mercer enrolled in Medicare?

Yes. Nathan Mercer is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

What insurance does Nathan Mercer accept?

Health plans from Providence Health Plan list Nathan Mercer as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

Is Nathan Mercer affiliated with any hospitals?

According to CMS data, Nathan Mercer is affiliated with Virginia Mason Medical Center, Grays Harbor Community Hospital, Harrison Medical Center and Kittitas Valley Community Hospital.

When was this NPI record last updated?

The NPPES record for Nathan Mercer was last updated on August 7, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 12 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.