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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
Dentist - Oral and Maxillofacial Surgery in Seattle, WA

Active since May 22, 2017PECOS Enrolled
916 NE RAVENNA BLVD STE B, SEATTLE, WA 98115(206) 525-6181(206) 385-5820 Get Directions Write a Review

NPPES record last updated: July 6, 2026. Verified against the NPPES registry weekly; last sync: August 09, 2026.

Record update history: Jul 6, 2026, Aug 6, 2024, Apr 9, 2024 and 2 more (5 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 and 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 Taxonomy1223S0112X
Provider Legal NameMICHAEL MANCHANG SIEW JR.Credential: DDS, MD
Location Address916 NE RAVENNA BLVD STE BSeattle, WA 98115-5566
Mailing Address916 Ne Ravenna Blvd Ste BSeattle, WA 98115-5566 · (206) 525-6181 · Fax (206) 385-5820
Phone(206) 525-6181
Fax(206) 385-5820
Sole ProprietorNo
Enumeration DateMay 22, 2017
Last NPPES UpdateJuly 6, 20265 updates tracked since enumeration
NPPES CertifiedJuly 6, 2026
✔ NPI 1164959169 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyDentist · Oral and Maxillofacial SurgeryDental Providers
Taxonomy Code1223S0112X
Licenses✔ Licensed in WA · 70011270✔ Licensed in TX · 37666
Definition
An oral and maxillofacial surgery dentist specialized in the diagnosis, surgical and adjunctive treatment of diseases, injuries and defects involving both the functional and esthetic aspects of the hard and soft tissues of the oral and maxillofacial region.
Also ListedOral & Maxillofacial SurgeryTaxonomy 204E00000X · License 70011270 (WA), 37666 (TX)
916 NE RAVENNA BLVD STE B, 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, and ordering and referring status from the CMS PECOS system.

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.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 98115 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
$97.43 typical visit price
range $63.67 – $189.37
Typical copayment $24.35 (range $15.91 – $47.34)
Most-billed visit code 99203
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.

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 B, Seattle, WA 98115. The listed phone number is (206) 525-6181.

What is Michael Siew's specialty?

The primary specialty registered for this NPI is Dentist, specializing in Oral and Maxillofacial Surgery, with taxonomy code 1223S0112X.

Is Michael Siew enrolled in Medicare?

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

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 13 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 July 6, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 40 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.