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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

MICHAEL MANCHANG SIEW JR. DDS, MD
NPI 1164959169
Oral & Maxillofacial Surgery in Seattle, WA

Active since May 22, 2017PECOS Enrolled
916 NE RAVENNA BLVD STE A, SEATTLE, WA 98115(206) 845-7333(206) 672-1369 Get Directions Write a Review

NPPES record last updated: October 20, 2026. Verified against the NPPES registry weekly; last sync: November 01, 2026.

Record update history: Aug 14, 2026, Jul 6, 2026, Aug 6, 2024 and 3 more (6 updates tracked since 2017).

About Michael Manchang Siew Jr. Dds, Md NPPES

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

MICHAEL MANCHANG SIEW JR. DDS, MD (NPI 1164959169) is an individual oral & maxillofacial surgery provider in Seattle, Washington, licensed in Washington (70011270) and active in the NPI registry since May 2017. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1164959169
Entity TypeIndividualMale
Primary Taxonomy204E00000X
Provider Legal NameMICHAEL MANCHANG SIEW JR.Credential: DDS, MD
Location Address916 NE RAVENNA BLVD STE ASeattle, WA 98115-5566
Mailing Address916 Ne Ravenna Blvd Ste ASeattle, WA 98115-5566 · (206) 845-7333 · Fax (206) 672-1369
Phone(206) 845-7333
Fax(206) 672-1369
Sole ProprietorNo
Enumeration DateMay 22, 2017
Last NPPES UpdateOctober 20, 20266 updates tracked since enumeration
NPPES CertifiedOctober 20, 2026
✔ NPI 1164959169 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyOral & Maxillofacial SurgeryAllopathic & Osteopathic Physicians
Taxonomy Code204E00000X
Licenses✔ Licensed in WA · 70011270✔ Licensed in TX · 37666
Definition
Oral and maxillofacial surgeons are trained to recognize and treat a wide spectrum of diseases, injuries and defects in the head, neck, face, jaws and the hard and soft tissues of the oral and maxillofacial region. They are also trained to administer anesthesia, and provide care in an office setting. They are trained to treat problems such as the extraction of wisdom teeth, misaligned jaws, tumors and cysts of the jaw and mouth, and to perform dental implant surgery.
Also ListedDentist · Oral and Maxillofacial SurgeryTaxonomy 1223S0112X · License 37666 (TX), 70011270 (WA)
916 NE RAVENNA BLVD STE A, Seattle, WA 98115
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Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter from Arizona Complete Health, Ambetter from Arkansas Health & Wellness, Ambetter from Louisiana Healthcare Connections and more.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Michael Manchang Siew Jr. Dds, Md 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 Michael Siew reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Umc El Paso Healthcare Inc
1,383 mi
General Practice
10410 VISTA DEL SOL DR
El Paso, TX 79925
  • Reassigned Medicare billing, Texas enrollment
  • 77 clinicians in this Medicare group
NPI 1528683810 (915) 200-2680

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

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 Michael Siew's NPI number?

The NPI number for Michael Siew is 1164959169. It was assigned to this individual provider in the NPPES registry on May 22, 2017.

Where is Michael Siew located?

Michael Siew practices at 916 NE Ravenna Blvd Ste A, Seattle, WA 98115. The listed phone number is (206) 845-7333.

What is Michael Siew's specialty?

The primary specialty registered for this NPI is Oral & Maxillofacial Surgery with taxonomy code 204E00000X.

Is Michael Siew enrolled in Medicare?

Yes. Michael Siew is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Michael Siew's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Michael Siew reassigns Medicare benefits to Umc El Paso Healthcare Inc (El Paso, TX). 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 Michael Siew's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Michael Siew accept?

Health plans from Ambetter from Arizona Complete Health, Ambetter from Arkansas Health & Wellness, Ambetter from Louisiana Healthcare Connections, Ambetter from Superior HealthPlan and Ambetter of Oklahoma and 15 other insurers list Michael Siew 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 Michael Siew was last updated on October 20, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 18 days 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.