NPPES file of Aug 9, 2026

Dan S. Grinstead, M.D.

Internal Medicine Physician · Walla Walla, WA

Dan S. Grinstead, M.D. is an internal medicine physician with a practice address in Walla Walla, Washington, and NPI 1881668010, issued on Feb 14, 2006. Check the license (Washington MD00044572, as entered in NPPES) on the Washington Medical Commission; the federal record below is the public data PlainDoctor holds for this provider.

Record from CMS NPPES, file of Aug 9, 2026 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1881668010
Name
Dan S. Grinstead
Credential
M.D.
Primary taxonomy
Internal Medicine Physician 207R00000X
License number
MD00044572 WA
Self-reported in NPPES; status is on the state search
Practice location
55 W Tietan St, Walla Walla, WA 99362
Phone
(509) 525-3720
Enumerated
Feb 14, 2006
Record last updated
Nov 27, 2007 (not updated in 19 years: call before relying on the address or phone)
Fax
(509) 522-1588
Medicaid IDs
8418337 WA
023157 OR
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). A record is not a license: verify it with the state board.
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8 nearest internal medicine physician records → All 3,079 in Washington → Look up another NPI →

Also registered at 55 W Tietan St

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Kevin Andrews, MDInternal Medicine Physician1174513873
  2. Shirley Ashley, MDPediatrics Physician1922083195
  3. Eric Ball, M.D.Internal Medicine Physician1275507485
  4. Thomas Ballard, MDDiagnostic Radiology Physician1750360012
  5. Theodore Bergstrom, M.D.Pediatrics Physician1598739716
  6. Barbara Blankenship, M.D.Diagnostic Radiology Physician1356305262

Verify Dan S. Grinstead in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersWashington Medical Commission
    Search for license MD00044572    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Open the Washington license search

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

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Dan S. Grinstead among 3,079 internal medicine physician records in Washington

Dan S. Grinstead, M.D. is one of 3,079 internal medicine physician records with a practice address in Washington. 75% 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 8% of them.

  • NPI issued2006 · 8% of these records are older, 55% newer
  • In a Medicare fileNo · 75% of these records are
  • In the CMS Doctors and Clinicians fileNo · 60% of these records are
  • Record last updated2007 · 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 207R00000X and a Washington practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

37 internal medicine physician records list a practice address in Walla Walla

They are 37 of the 1,276 NPPES records with a practice address in Walla Walla, and 3,079 internal medicine physician records in Washington. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.

All 3,079 in Washington → Every provider in Walla Walla → Internal Medicine Physician nationwide →

The 8 internal medicine physician records with the nearest ZIP codes

  1. Kevin Andrews, MDWalla Walla, WA 993621174513873
  2. Eric Ball, M.D.Walla Walla, WA 993621275507485
  3. Karen Geheb, M.D.Walla Walla, WA 993621972532745
  4. Philip Hooper, MDWalla Walla, WA 993621154307742
  5. Eric Jauhiainen, M.D.Walla Walla, WA 993621235103466
  6. Stevie Mazyck, MDWalla Walla, WA 993621902835697
  7. Patricia McIlvaine, M.D.Walla Walla, WA 993621689648594
  8. Cynthia Rasch, MDWalla Walla, WA 993621124075841

Common questions

What is Dan S. Grinstead, M.D.'s NPI number?

Dan S. Grinstead, M.D.'s National Provider Identifier (NPI) is 1881668010, issued on Feb 14, 2006. An NPI identifies a provider in billing; it is not a license.

Where is Dan S. Grinstead, M.D. located?

The NPPES record lists a practice address at 55 W Tietan St, Walla Walla, WA, 99362. Phone: (509) 525-3720. Providers update this record themselves, so call before visiting.

How can I verify Dan S. Grinstead, M.D.'s license?

NPPES lists Washington license number MD00044572, 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.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

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.