Mark William Hamblin, M.D.
Psychiatry Physician · Seattle, WA
Mark William Hamblin, M.D. is a psychiatry physician with a practice address in Seattle, Washington, and NPI 1245335363, issued on Sep 13, 2006. Check the license (Washington MD00028139, as entered in NPPES) on the Washington Medical Commission; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- Mark William Hamblin
- Credential
- M.D.
- Primary taxonomy
- Psychiatry Physician 2084P0800X
- License number
- MD00028139 WA
Self-reported in NPPES; status is on the state search - Practice location
- 4020 E Madison St Ste 325, Seattle, WA 98112
- Phone
- (206) 715-4862
- Enumerated
- Sep 13, 2006
- Record last updated
- Jun 12, 2020 (not updated in 6 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest psychiatry physician records → All 1,195 in Washington → Look up another NPI →
Verify Mark William Hamblin in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWashington Medical Commission
Search for license MD00028139Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Mark William Hamblin among 1,195 psychiatry physician records in Washington
Mark William Hamblin, M.D. is one of 1,195 psychiatry physician records with a practice address in Washington. 61% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2006, is newer than 5% of them.
- NPI issued2006 · 5% of these records are older, 57% newer
- In a Medicare fileNo · 61% of these records are
- In the CMS Doctors and Clinicians fileNo · 39% of these records are
- Record last updated2020 · 63% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2084P0800X and a Washington practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
485 psychiatry physician records list a practice address in Seattle
They are 485 of the 41,956 NPPES records with a practice address in Seattle, and 1,195 psychiatry physician records in Washington. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 1,195 in Washington → Every provider in Seattle → Psychiatry Physician nationwide →
The 8 psychiatry physician records with the nearest ZIP codes
- Marco Baquero, MDSeattle, WA 981121730298902
- Rowin Cantrell, M.D.Seattle, WA 981121821042813
- Margaret Cashman, MD ACPSeattle, WA 981121366444325
- Tobias DangSeattle, WA 981121184704165
- Scot Gibson, MDSeattle, WA 981121639289143
- Kate Grossman, MDSeattle, WA 981121629159777
- Mark Hoerr, MDSeattle, WA 981121356378400
- John Horton, M.D.Seattle, WA 981121174553036
Common questions
What is Mark William Hamblin, M.D.'s NPI number?
Mark William Hamblin, M.D.'s National Provider Identifier (NPI) is 1245335363, issued on Sep 13, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mark William Hamblin, M.D. located?
The NPPES record lists a practice address at 4020 E Madison St Ste 325, Seattle, WA, 98112. Phone: (206) 715-4862. Providers update this record themselves, so call before visiting.
How can I verify Mark William Hamblin, M.D.'s license?
NPPES lists Washington license number MD00028139, 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.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. 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.