DR. STEPHEN F SLACK M.D.
NPI 1619080835
Obstetrics & Gynecology in Seattle, WA

Q: What is Stephen Slack's NPI number?

The NPI number for Stephen Slack is 1619080835. It was assigned to this individual provider in the NPPES registry on August 15, 2006.

Q: What is Stephen Slack's specialty?

The primary specialty registered for this NPI is Obstetrics & Gynecology with taxonomy code 207V00000X.

Q: When was this NPI record last updated?

The NPPES record for Stephen Slack was last updated on July 21, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.

Active since August 15, 2006PECOS EnrolledAccepts Medicare Assignment

1801 NW MARKET ST, SUITE 100, SEATTLE, WA 98107(206) 782-9335(206) 781-8713 Get Directions Write a Review

NPPES record last updated: July 21, 2022. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Jul 21, 2022, Mar 17, 2018, Jun 17, 2017 (3 updates tracked since 2017).

On this page

About Dr. Stephen F Slack M.d. NPPES

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

DR. STEPHEN F SLACK M.D. (NPI 1619080835) is an individual obstetrics & gynecology provider in Seattle, Washington, licensed in Washington (MD00023080) and active in the NPI registry since August 2006. He is enrolled in Medicare PECOS, is affiliated with Providence Regional Medical Center Everett, and maintains a secondary practice location in Arlington.

NPPES Registry Identity

NPI1619080835

Entity TypeIndividualMale

Primary Taxonomy207V00000X

Provider Legal NameDR. STEPHEN F SLACKCredential: M.D.

Location Address1801 NW MARKET ST, SUITE 100Seattle, WA 98107-3987

Mailing Address1801 Nw Market St, Suite 100Seattle, WA 98107-3987 · (206) 782-9335 · Fax (206) 781-8713

Phone(206) 782-9335

Fax(206) 781-8713

Sole ProprietorNo

Medical School CMSWashington University School Of MedicineGraduated 1984

Enumeration DateAugust 15, 2006

Last NPPES UpdateJuly 21, 20223 updates tracked since enumeration

✔ NPI 1619080835 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyObstetrics & GynecologyAllopathic & Osteopathic Physicians

Taxonomy Code207V00000X

License✔ Licensed in WA · MD00023080

Definition

An obstetrician/gynecologist possesses special knowledge, skills and professional capability in the medical and surgical care of the female reproductive system and associated disorders. This physician serves as a consultant to other physicians and as a primary physician for women.

1801 NW MARKET ST, Seattle, WA 98107

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Secondary Practice Location 1

Location 1903 Medical Center DrArlington, WA 98223-1697 · Phone (360) 435-0242 · Fax (360) 425-9135

Other Identifiers 1

Other00023080WA · Md #

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, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Stephen F Slack M.d. 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 ID2860416427

PECOS Enrollment IDI20060123000165

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 Reassignments

Medicare enrollment records show Stephen Slack reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

King County Public Hospital District No 2

9.6 mi

Internal Medicine

11521 NE 128TH ST, STE 100
Kirkland, WA 98034

Reassigned Medicare billing, Washington enrollment
1,074 clinicians in this Medicare group

NPI 1548350713 (425) 899-6800

Obhg Washington, PC

14 mi

Obstetrics & Gynecology

1800 NW MYHRE RD
Silverdale, WA 98383

Reassigned Medicare billing, Washington enrollment
223 clinicians in this Medicare group

NPI 1962729525 (800) 967-2289

Valley Medical Group-Renton

17 mi

General Acute Care Hospital

400 S 43RD ST
Renton, WA 98055

Reassigned Medicare billing, Washington enrollment
689 clinicians in this Medicare group

NPI 1619209574 (425) 228-3440

Public Hospital Dist No 1 Skagit

34 mi

Primary Care

405 W. STANLEY STREET
Granite Falls, WA 98252

Reassigned Medicare billing, Washington enrollment
463 clinicians in this Medicare group

NPI 1033164470 (360) 619-2419

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

Hospital Affiliations CMS Care Compare

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

Providence Regional Medical Center Everett

Acute Care Hospitals · Everett, WA

3/5 CMS rating

OwnershipVoluntary non-profit - Church

CMS Certification Number500014

Location1321 Colby AvenueEverett, WA 98201 · Snohomish County

Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 98107 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

$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.

DR. JOHN K. TIDWELL DDS

Dentist (Oral and Maxillofacial Surgery)

1801 NW MARKET ST, SUITE 108
SEATTLE, WA 98107

King County (206) 783-9672

GARY DAVID ROSEN M.D.

Family Medicine

1801 NW MARKET ST, SUITE 203
SEATTLE, WA 98107

King County (206) 781-6079

VINCENT T. CHAN MD

Otolaryngology

1801 NW MARKET ST, SUITE 411
SEATTLE, WA 98107

King County (206) 781-6072

TERESA LYNN GOEPFERT D. O.

Obstetrics & Gynecology

1801 NW MARKET ST, 207
SEATTLE, WA 98107

King County (206) 781-6161

JOHN R. BAGLEY LMP

Massage Therapist

1801 NW MARKET ST, SUITE 200
SEATTLE, WA 98107

King County (206) 784-2800

JOHN K TIDWELL DDS PS

Dentist (Oral and Maxillofacial Surgery)

1801 NW MARKET ST, SUITE 108
SEATTLE, WA 98107

King County (206) 783-9672

CYNTHIA BIRD JOHNSON M.D.

Family Medicine

1801 NW MARKET ST, SUITE 203
SEATTLE, WA 98107

King County (206) 781-6079

DR. RICHARD ALAN FOGERTY M.D.

Internal Medicine

1801 NW MARKET ST, SUITE 309
SEATTLE, WA 98107

King County (206) 784-0940

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 Stephen Slack's NPI number?

The NPI number for Stephen Slack is 1619080835. It was assigned to this individual provider in the NPPES registry on August 15, 2006.

Where is Stephen Slack located?

Stephen Slack practices at 1801 NW Market St Suite 100, Seattle, WA 98107. The listed phone number is (206) 782-9335.

What is Stephen Slack's specialty?

The primary specialty registered for this NPI is Obstetrics & Gynecology with taxonomy code 207V00000X.

Is Stephen Slack enrolled in Medicare?

Yes. Stephen Slack 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.

Which organizations bill Medicare for Stephen Slack's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Stephen Slack reassigns Medicare benefits to 4 organizations: King County Public Hospital District No 2 (Kirkland, WA), Obhg Washington, PC (Silverdale, WA), Valley Medical Group-Renton (Renton, WA) and Public Hospital Dist No 1 Skagit (Granite Falls, WA). Each 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 Stephen Slack's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Stephen Slack accept?

Health plans from Providence Health Plan list Stephen Slack 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 Stephen Slack affiliated with any hospitals?

According to CMS data, Stephen Slack is affiliated with Providence Regional Medical Center Everett.

When was this NPI record last updated?

The NPPES record for Stephen Slack was last updated on July 21, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.