Mark Walter Layton, M.D.
Rheumatology Physician · Olympia, WA
Mark Walter Layton, M.D. is a rheumatology physician with a practice address in Olympia, Washington, and NPI 1891846077, issued on Jan 15, 2007. Check the license (Washington MD00024518, as entered in NPPES) on the Washington Medical Commission; the Medicare figures below come from public CMS files.
- Name
- Mark Walter Layton
- Credential
- M.D.
- Primary taxonomy
- Rheumatology Physician 207RR0500X
- License number
- MD00024518 WA
Self-reported in NPPES; status is on the state search - Practice location
- 1212 Harrison Ave NW, Olympia, WA 98502
- Phone
- (360) 754-6700
- Enumerated
- Jan 15, 2007
- Record last updated
- Jun 30, 2026
- Fax
- (360) 754-0164
- Medicaid ID
- 1027689 WA
- Medicare enrollment
- Enrolled (PECOS I20040226000237); accepts Medicare assignment
- Medical or professional school
- University Of Washington School Of Medicine, 1982
- Entity
- Type 1 · individual
8 nearest rheumatology physician records → All 200 in Washington → Look up another NPI →
Also registered at 1212 Harrison Ave NW
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Susan Kaisaki, P.A.-CMedical Physician Assistant1629126842
Verify Mark Walter Layton in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWashington Medical Commission
Search for license MD00024518Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
26% more Medicare Part D claims than the average rheumatology physician in 2024
2,495 Medicare Part D claims for 288 beneficiaries, against an average of 1,978 among the 6,301 providers of this specialty who prescribed in Part D. Brand-name drugs were 10% of claims. 745 claims were for opioids.
Most prescribed
- Prednisone489 claims
- Hydrocodone-Acetaminophen391 claims
- Methotrexate310 claims
- Tramadol Hcl170 claims
- Hydroxychloroquine Sulfate153 claims
- Diclofenac Sodium89 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The MIPS final score for 2023 (Medicare payment program): 25.1 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).
Industry payments in 2024: $1,153.49
65 payments; by number, the most common kind was food and beverage; the largest payer was Amgen Inc. The 4,486 providers of this specialty with any payment received $8,538.33 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Mark Walter Layton among 200 rheumatology physician records in Washington
Mark Walter Layton, M.D. is one of 200 rheumatology physician records with a practice address in Washington. 77% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 49% of them.
- NPI issued2007 · 49% of these records are older, 40% newer
- In a Medicare fileYes · 77% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated1982 · median 2005 among the 123 with a school on file
- Record last updated2026 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RR0500X and a Washington practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Rheumatology Physician providers in Washington
There are 200 rheumatology physician records in Washington.
All 200 in Washington → Every provider in Olympia → Rheumatology Physician nationwide →
The 8 rheumatology physician records with the nearest ZIP codes
- Jowairiyya Ahmad, M.D.Lacey, WA 985031447539408
- Koushik SangarajuLacey, WA 985031679148043
- Deepa Gali, MDLakewood, WA 984991376856922
- Yasmin KassamLakewood, WA 984991477516854
- Daniel Kim, M.D.Lakewood, WA 984991508094707
- Dina Titova, MDLakewood, WA 984991861549651
- Zhiqian Wang, MDLakewood, WA 984991760481048
- Charles Paxson, M.D.Tacoma, WA 984931801998497
Common questions
What is Mark Walter Layton, M.D.'s NPI number?
Mark Walter Layton, M.D.'s National Provider Identifier (NPI) is 1891846077, issued on Jan 15, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Mark Walter Layton, M.D. located?
The NPPES record lists a practice address at 1212 Harrison Ave NW, Olympia, WA, 98502. Phone: (360) 754-6700. Providers update this record themselves, so call before visiting.
How can I verify Mark Walter Layton, M.D.'s license?
NPPES lists Washington license number MD00024518, 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.
How much does Mark Walter Layton, M.D. prescribe under Medicare Part D?
In 2024, Mark Walter Layton, M.D. had 2,495 Medicare Part D claims for 288 beneficiaries; the average among rheumatology physician prescribers was 1,978. Part D covers Medicare prescriptions only.
What is Mark Walter Layton, M.D.'s MIPS final score?
The 2023 MIPS final score is 25.1 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.