Nathaniel Eric Siev, MD
Anesthesiology Physician · Tacoma, WA
Nathaniel Eric Siev, MD is an anesthesiology physician with a practice address in Tacoma, Washington, and NPI 1023515269, issued on Apr 12, 2018. Check the license (Washington MD61218481, as entered in NPPES) on the Washington Medical Commission; the Medicare figures below come from public CMS files.
- Name
- Nathaniel Eric Siev
- Credential
- MD
- Primary taxonomy
- Anesthesiology Physician 207L00000X
- License number
- MD61218481 WA
Self-reported in NPPES; status is on the state search - Practice location
- 1717 S J St, Tacoma, WA 98405
- Phone
- (253) 426-4101
- Enumerated
- Apr 12, 2018
- Record last updated
- Dec 30, 2025
- Medicaid ID
- 2205683 WA
- Medicare enrollment
- Enrolled (PECOS I20220623000973); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest anesthesiology physician records → All 1,701 in Washington → Look up another NPI →
Also registered at 1717 S J St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Jennifer Aquino, M.D.Internal Medicine Physician1184746067
- Freddy AragonStudent in an Organized Health Care Education/Training Program1447617626
- Patti Aramburu, ARNPFamily Nurse Practitioner1952497356
Verify Nathaniel Eric Siev in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWashington Medical Commission
Search for license MD61218481Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
The MIPS final score for 2023 (Medicare payment program): 93.1 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- Franciscan Medical GroupTacoma, WA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Nathaniel Eric Siev among 1,701 anesthesiology physician records in Washington
Nathaniel Eric Siev, MD is one of 1,701 anesthesiology physician records with a practice address in Washington. 70% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2018, is newer than 86% of them.
- NPI issued2018 · 86% of these records are older, 11% newer
- In a Medicare fileYes · 70% of these records are
- In the CMS Doctors and Clinicians fileYes · 65% of these records are
- Graduated2018 · median 2007 among the 1,103 with a school on file
- Record last updated2025 · 65% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207L00000X and a Washington practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
150 anesthesiology physician records list a practice address in Tacoma
They are 150 of the 13,715 NPPES records with a practice address in Tacoma, and 1,701 anesthesiology physician records in Washington.
All 1,701 in Washington → Every provider in Tacoma → Anesthesiology Physician nationwide →
The 8 anesthesiology physician records with the nearest ZIP codes
- Ali Afrassiabi, MDTacoma, WA 984051760486286
- Stephen Bolt, M.D.Tacoma, WA 984051710967237
- Andrew Foster, MDTacoma, WA 984051710957246
- William Hughes, MDTacoma, WA 984051699779082
- Will Kellogg, MDTacoma, WA 984051578509444
- Steve Lee, M.D.Tacoma, WA 984051922036318
- Glaucia Moreira, M.D.Tacoma, WA 984051003843962
- Timothy Phillips, MDTacoma, WA 984051235185091
Common questions
What is Nathaniel Eric Siev, MD's NPI number?
Nathaniel Eric Siev, MD's National Provider Identifier (NPI) is 1023515269, issued on Apr 12, 2018. An NPI identifies a provider in billing; it is not a license.
Where is Nathaniel Eric Siev, MD located?
The NPPES record lists a practice address at 1717 S J St, Tacoma, WA, 98405. Phone: (253) 426-4101. Providers update this record themselves, so call before visiting.
How can I verify Nathaniel Eric Siev, MD's license?
NPPES lists Washington license number MD61218481, as entered by the provider. Search the Washington Medical Commission at https://wahelms.my.site.com/s/license-search. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
What is Nathaniel Eric Siev, MD's MIPS final score?
The 2023 MIPS final score is 93.1 of 100. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.