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STEPHEN TILLES M.D.
NPI 1417984956
Allergy & Immunology in Seattle, WA

Active since June 28, 2006PECOS EnrolledAccepts Medicare Assignment
9725 3RD AVE NE STE 500, SEATTLE, WA 98115(206) 527-1200(206) 527-2514 Get Directions Write a Review

NPPES record last updated: December 7, 2016. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About Stephen Tilles M.d. NPPES

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

STEPHEN TILLES M.D. (NPI 1417984956) is an individual allergy & immunology provider in Seattle, Washington, licensed in Washington (MD00038961) and active in the NPI registry since June 2006. He is enrolled in Medicare PECOS and is a graduate of University Of California, San Diego School Of Medicine (1990).

NPPES Registry Identity

NPI1417984956
Entity TypeIndividualMale
Primary Taxonomy207K00000X
Provider Legal NameSTEPHEN TILLESCredential: M.D.
Location Address9725 3RD AVE NE STE 500Seattle, WA 98115-2024
Mailing Address9725 3rd Ave Ne Ste 500Seattle, WA 98115-2024 · (206) 527-1200 · Fax (206) 527-2514
Phone(206) 527-1200
Fax(206) 527-2514
Sole ProprietorNo
Medical School CMSUniversity Of California, San Diego School Of MedicineGraduated 1990
Enumeration DateJune 28, 2006
Last NPPES UpdateDecember 7, 2016
✔ NPI 1417984956 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyAllergy & ImmunologyAllopathic & Osteopathic Physicians
Taxonomy Code207K00000X
License✔ Licensed in WA · MD00038961
Definition
An allergist-immunologist is trained in evaluation, physical and laboratory diagnosis, and management of disorders involving the immune system. Selected examples of such conditions include asthma, anaphylaxis, rhinitis, eczema, and adverse reactions to drugs, foods, and insect stings as well as immune deficiency diseases (both acquired and congenital), defects in host defense, and problems related to autoimmune disease, organ transplantation, or malignancies of the immune system.
9725 3RD AVE NE STE 500, Seattle, WA 98115
Open in Google Maps ↗

Other Identifiers 6

Other030004970WA · Rail Road Medicare
Medicare UPINF27183WA
Other030005045WA · Railroad Medical
Other2079TIWA · Regence
Other030005046WA · Railroad Medicare
Medicaid8174450WA

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Premera Blue Cross Blue Shield of Alaska, 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

Stephen Tilles 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 ID648164236
PECOS Enrollment IDI20040213000056
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

3

Medicare enrollment records show Stephen Tilles reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Northwest Asthma & Allergy Center
Same address
Allergy & Immunology
9725 3RD AVE NE, #500
Seattle, WA 98115
  • Reassigned Medicare billing, Washington enrollment
  • 19 clinicians in this Medicare group
NPI 1679504526 (206) 527-1200
Seattle Children's Hospital
3.3 mi
Specialist
4800 SAND POINT WAY NE
Seattle, WA 98105
  • Reassigned Medicare billing, Washington enrollment
  • Medicare enrollment name: Seattle Childrens Hospital
  • 912 clinicians in this Medicare group
NPI 1003319500 (206) 987-2000
The Association Of University Physicians
6.6 mi
Anesthesiology
701 5TH AVE, SUITE 700
Seattle, WA 98104
  • Reassigned Medicare billing, Washington enrollment
  • 4,364 clinicians in this Medicare group
NPI 1023041159 (206) 543-6420

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

Other Providers at the Same Location NPPES 13

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

ASHLEY M JERATH TATUM M.D.
Allergy & Immunology
9725 3RD AVE NE STE 500
SEATTLE, WA 98115
King County (206) 527-1200
MICHELE R. HINATSU ARNP
Physician Assistant (Medical)
9725 3RD AVE NE STE 500
SEATTLE, WA 98115
King County (206) 527-1200
FRANK S VIRANT M.D.
Allergy & Immunology
9725 3RD AVE NE STE 500
SEATTLE, WA 98115
King County (206) 527-1200
PAUL V WILLIAMS M.D.
Allergy & Immunology
9725 3RD AVE NE STE 500
SEATTLE, WA 98115
King County (206) 527-1200
THAO N TRAN MD
Allergy & Immunology
9725 3RD AVE NE STE 500
SEATTLE, WA 98115
King County (206) 527-1200
BANI PREET KAUR M.D.
Allergy & Immunology
9725 3RD AVE NE STE 500
SEATTLE, WA 98115
King County (206) 527-1200
MARY V LASLEY M.D.
Allergy & Immunology
9725 3RD AVE NE STE 500
SEATTLE, WA 98115
King County (206) 527-1200
DR. LEONARD C. ALTMAN M.D.
Allergy & Immunology
9725 3RD AVE NE STE 500
SEATTLE, WA 98115
King County (206) 527-1200

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 Tilles's NPI number?

The NPI number for Stephen Tilles is 1417984956. It was assigned to this individual provider in the NPPES registry on June 28, 2006.

Where is Stephen Tilles located?

Stephen Tilles practices at 9725 3rd Ave NE Ste 500, Seattle, WA 98115. The listed phone number is (206) 527-1200.

What is Stephen Tilles's specialty?

The primary specialty registered for this NPI is Allergy & Immunology with taxonomy code 207K00000X.

Is Stephen Tilles enrolled in Medicare?

Yes. Stephen Tilles 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 Tilles's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Stephen Tilles reassigns Medicare benefits to 3 organizations: Northwest Asthma & Allergy Center (Seattle, WA), Seattle Children's Hospital (Seattle, WA) and The Association Of University Physicians (Seattle, 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 Tilles's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Stephen Tilles accept?

Health plans from Premera Blue Cross Blue Shield of Alaska and Providence Health Plan list Stephen Tilles 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.

When was this NPI record last updated?

The NPPES record for Stephen Tilles was last updated on December 7, 2016. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 9 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.