Margaret K. Merrifield, M.D.
Family Medicine Physician · Richland, WA
Margaret K. Merrifield, M.D. is a family medicine physician with a practice address in Richland, Washington, and NPI 1568517480, issued on Jan 23, 2007. Check the license (Washington MD00031118, as entered in NPPES) on the Washington Medical Commission; the Medicare figures below come from public CMS files.
- Name
- Margaret K. Merrifield
- Credential
- M.D.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- MD00031118 WA
Self-reported in NPPES; status is on the state search - Practice location
- 4960 Rau St, Richland, WA 99352
- Phone
- (509) 628-3060
- Enumerated
- Jan 23, 2007
- Record last updated
- Jan 8, 2009 (not updated in 17 years: call before relying on the address or phone)
- Fax
- (509) 628-3024
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 5,534 in Washington → Look up another NPI →
Verify Margaret K. Merrifield in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWashington Medical Commission
Search for license MD00031118Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
98% fewer Medicare Part D claims than the average family medicine physician in 2024
58 Medicare Part D claims for 12 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 21% of claims. 16 claims were for opioids.
Most prescribed
- Levothyroxine Sodium20 claims
- Tramadol Hcl16 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.
Margaret K. Merrifield among 5,534 family medicine physician records in Washington
Margaret K. Merrifield, M.D. is one of 5,534 family medicine physician records with a practice address in Washington. 73% 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 42% of them.
- NPI issued2007 · 42% of these records are older, 47% newer
- In a Medicare fileYes · 73% of these records are
- In the CMS Doctors and Clinicians fileNo · 60% of these records are
- Record last updated2009 · 57% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a Washington practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
47 family medicine physician records list a practice address in Richland
They are 47 of the 1,955 NPPES records with a practice address in Richland, and 5,534 family medicine physician records in Washington.
All 5,534 in Washington → Every provider in Richland → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Geoffrey Ames, MDRichland, WA 993521750447504
- Charles Batayola, D.O.Richland, WA 993521447223904
- Kelly Cote, DORichland, WA 993521780684019
- Erick Isaacson, MDRichland, WA 993521447243308
- Charles Krause, M.D.Richland, WA 993521609976208
- Karl Kuzis, MD PHDRichland, WA 993521154402253
- Matthew Lawrence, MDRichland, WA 993521255324109
- James Leedy, M.D.Richland, WA 993521811909005
Common questions
What is Margaret K. Merrifield, M.D.'s NPI number?
Margaret K. Merrifield, M.D.'s National Provider Identifier (NPI) is 1568517480, issued on Jan 23, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Margaret K. Merrifield, M.D. located?
The NPPES record lists a practice address at 4960 Rau St, Richland, WA, 99352. Phone: (509) 628-3060. Providers update this record themselves, so call before visiting.
How can I verify Margaret K. Merrifield, M.D.'s license?
NPPES lists Washington license number MD00031118, 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 Margaret K. Merrifield, M.D. prescribe under Medicare Part D?
In 2024, Margaret K. Merrifield, M.D. had 58 Medicare Part D claims for 12 beneficiaries; the average among family medicine physician prescribers was 3,544. Part D covers Medicare prescriptions only.
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.