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DR. LELAND G. SIWEK M.D.
NPI 1801894811
Thoracic Surgery (Cardiothoracic Vascular Surgery) in Spokane, WA

Active since July 13, 2005PECOS Enrolled
62 W 7TH AVE STE 110, SPOKANE, WA 99204(509) 456-0262(509) 462-5059 Get Directions Write a Review

NPPES record last updated: April 1, 2021. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Apr 1, 2021, Feb 7, 2019 (2 updates tracked since 2019).

About Dr. Leland G. Siwek M.d. NPPES

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

DR. LELAND G. SIWEK M.D. (NPI 1801894811) is an individual thoracic surgery (cardiothoracic vascular surgery) provider in Spokane, Washington, licensed in Washington (MD00025268) and active in the NPI registry since July 2005. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1801894811
Entity TypeIndividualMale
Primary Taxonomy208G00000X
Provider Legal NameDR. LELAND G. SIWEKCredential: M.D.
Location Address62 W 7TH AVE STE 110Spokane, WA 99204-2321
Mailing Address62 W 7th Ave Ste 110Spokane, WA 99204-2321 · (509) 456-0262 · Fax (509) 462-5059
Phone(509) 456-0262
Fax(509) 462-5059
Sole ProprietorNo
Enumeration DateJuly 13, 2005
Last NPPES UpdateApril 1, 20212 updates tracked since enumeration
NPPES CertifiedApril 1, 2021
✔ NPI 1801894811 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyThoracic Surgery (Cardiothoracic Vascular Surgery)Allopathic & Osteopathic Physicians
Taxonomy Code208G00000X
Licenses✔ Licensed in WA · MD00025268✔ Licensed in ID · M-8950
Definition
A thoracic surgeon provides the operative, perioperative and critical care of patients with pathologic conditions within the chest. Included is the surgical care of coronary artery disease, cancers of the lung, esophagus and chest wall, abnormalities of the trachea, abnormalities of the great vessels and heart valves, congenital anomalies, tumors of the mediastinum and diseases of the diaphragm. The management of the airway and injuries of the chest is within the scope of the specialty.
62 W 7TH AVE STE 110, Spokane, WA 99204
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Other Identifiers 5

Medicaid1043025WA
OtherG8870921WA · Medicare Ptan
OtherG8878302WA · Medicare Ptan
Other11106981ID · Medicare Ptan
Medicaid004254400ID

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 (PECOS)

Dr. Leland G. Siwek 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 Leland Siwek reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Providence Health & Services-Wa
Same address
Thoracic Surgery (Cardiothoracic Vascular Surgery)
62 W 7TH AVE STE 110
Spokane, WA 99204
  • Reassigned Medicare billing, Washington enrollment
  • 19 clinicians in this Medicare group
NPI 1538311287 (509) 456-0262

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

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 99204 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
$172.80 typical visit price
range $57.27 – $172.80
Typical copayment $43.20 (range $14.31 – $43.20)
Most-billed visit code 99205
Established Patient
$71.29 typical visit price
range $18.56 – $141.11
Typical copayment $17.82 (range $4.64 – $35.27)
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.

MARY CRISTINA SMITH MD
Thoracic Surgery (Cardiothoracic Vascular Surgery)
62 W 7TH AVE STE 110
SPOKANE, WA 99204
Spokane County (509) 456-0262
KURT WILLIAM KOHLER PA-C
Physician Assistant (Surgical)
62 W 7TH AVE STE 110
SPOKANE, WA 99204
Spokane County (509) 456-0262
DAVIN VALENTI
Nurse Practitioner
62 W 7TH AVE STE 110
SPOKANE, WA 99204
Spokane County (509) 456-0262
DR. STEVEN J. NISCO M.D.
Thoracic Surgery (Cardiothoracic Vascular Surgery)
62 W 7TH AVE STE 110
SPOKANE, WA 99204
Spokane County (509) 456-0262
JEREMY MULLAVEY ARNP
Nurse Practitioner (Critical Care Medicine)
62 W 7TH AVE STE 110
SPOKANE, WA 99204
Spokane County (509) 456-0262
JASON MAYBERRY PAC
Physician Assistant (Surgical)
62 W 7TH AVE STE 110
SPOKANE, WA 99204
Spokane County (509) 462-6485
ANNAMARIE ROSE VAUGHAN MHS, PA-C
Physician Assistant (Surgical)
62 W 7TH AVE STE 110
SPOKANE, WA 99204
Spokane County (509) 462-6485
JIN MEI LO-TOMBLIN PA-C
Physician Assistant (Surgical)
62 W 7TH AVE STE 110
SPOKANE, WA 99204
Spokane County (509) 456-0262

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 Leland Siwek's NPI number?

The NPI number for Leland Siwek is 1801894811. It was assigned to this individual provider in the NPPES registry on July 13, 2005.

Where is Leland Siwek located?

Leland Siwek practices at 62 W 7th Ave Ste 110, Spokane, WA 99204. The listed phone number is (509) 456-0262.

What is Leland Siwek's specialty?

The primary specialty registered for this NPI is Thoracic Surgery (Cardiothoracic Vascular Surgery) with taxonomy code 208G00000X.

Is Leland Siwek enrolled in Medicare?

Yes. Leland Siwek is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Leland Siwek's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Leland Siwek reassigns Medicare benefits to Providence Health & Services-Wa (Spokane, 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 Leland Siwek's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Leland Siwek accept?

Health plans from Providence Health Plan list Leland Siwek 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 Leland Siwek was last updated on April 1, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 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.