Cynthia Lynn Mason, M.D.
Family Medicine Physician · West Allis, WI
Cynthia Lynn Mason, M.D. is a family medicine physician with a practice address in West Allis, Wisconsin, and NPI 1295702140, issued on Feb 28, 2006. Check the license (Wisconsin 29477-020, as entered in NPPES) on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Cynthia Lynn Mason
- Credential
- M.D.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 29477-020 WI
Self-reported in NPPES; status is on the state search - Practice location
- 555 S 108TH St, West Allis, WI 53214
- Phone
- (414) 566-6400
- Enumerated
- Feb 28, 2006
- Record last updated
- Jul 13, 2026
- Fax
- (414) 566-3866
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 3,765 in Wisconsin → Look up another NPI →
Also registered at 555 S 108TH St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Cynthia Lynn Mason in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWisconsin Medical Examining Board
Search for license 29477-020Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
96% fewer Medicare Part D claims than the average family medicine physician in 2024
138 Medicare Part D claims for 27 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 12% of claims.
Most prescribed
- Atorvastatin Calcium19 claims
- Hydrochlorothiazide13 claims
- Lisinopril12 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.
Cynthia Lynn Mason among 3,765 family medicine physician records in Wisconsin
Cynthia Lynn Mason, M.D. is one of 3,765 family medicine physician records with a practice address in Wisconsin. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 10% of them.
- NPI issued2006 · 10% of these records are older, 46% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileNo · 62% of these records are
- Record last updated2026 · 56% 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 Wisconsin practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
51 family medicine physician records list a practice address in West Allis
They are 51 of the 1,362 NPPES records with a practice address in West Allis, and 3,765 family medicine physician records in Wisconsin.
All 3,765 in Wisconsin → Every provider in West Allis → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Renato Azcueta, MDWest Allis, WI 532141346258902
- Alice Bustos, MDWest Allis, WI 532141861440505
- Joseph Cronin, DOWest Allis, WI 532141164431219
- Mamatha Geddam, MDWest Allis, WI 532141770660300
- Patricia Hago, M.D.West Allis, WI 532141770589202
- Michele Hall, MDWest Allis, WI 532141942305115
- R. Kevin Kennelly, P.A.West Allis, WI 532141780651604
- Roberto Musni, MDWest Allis, WI 532141730296161
Common questions
What is Cynthia Lynn Mason, M.D.'s NPI number?
Cynthia Lynn Mason, M.D.'s National Provider Identifier (NPI) is 1295702140, issued on Feb 28, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Cynthia Lynn Mason, M.D. located?
The NPPES record lists a practice address at 555 S 108TH St, West Allis, WI, 53214. Phone: (414) 566-6400. Providers update this record themselves, so call before visiting.
How can I verify Cynthia Lynn Mason, M.D.'s license?
NPPES lists Wisconsin license number 29477-020, as entered by the provider. Search the Wisconsin Medical Examining Board at https://dsps.wi.gov/Pages/BoardsCouncils/MEB/Default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Cynthia Lynn Mason, M.D. prescribe under Medicare Part D?
In 2024, Cynthia Lynn Mason, M.D. had 138 Medicare Part D claims for 27 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.