Anthony Mark Masi, M.D.
Sleep Medicine (Internal Medicine) Physician · Ballwin, MO
Anthony Mark Masi, M.D. is a sleep medicine (internal medicine) physician with a practice address in Ballwin, Missouri, and NPI 1902884844, issued on Dec 31, 2005. Check the license (Missouri R3P21, as entered in NPPES) on the Missouri Board of Registration for the Healing Arts; the Medicare figures below come from public CMS files.
- Name
- Anthony Mark Masi
- Credential
- M.D.
- Primary taxonomy
- Sleep Medicine (Internal Medicine) Physician 207RS0012X
- License number
- R3P21 MO
Self-reported in NPPES; status is on the state search - Practice location
- 13975 Manchester RD, Ballwin, MO 63011
- Phone
- (636) 391-1222
- Enumerated
- Dec 31, 2005
- Record last updated
- Jun 6, 2012 (not updated in 14 years: call before relying on the address or phone)
- Fax
- (636) 333-1259
- Medicaid ID
- 203472246 MO
- Medicare enrollment
- Enrolled (PECOS I20100602000819); accepts Medicare assignment
- Medical or professional school
- University Of Illinois College Of Med (Chi/Peor/Rock/Chm-Urb), 1987
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
Also registered at 13975 Manchester RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Ronald Gross, DDSGeneral Practice Dentistry1467456491
- Susan Masi, LPCProfessional Counselor1629528633
Verify Anthony Mark Masi in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMissouri Board of Registration for the Healing Arts
Search for license R3P21Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
24% more Medicare Part D claims than the average sleep medicine (internal medicine) physician in 2024
725 Medicare Part D claims for 135 beneficiaries, against an average of 585 among the 852 providers of this specialty who prescribed in Part D. Brand-name drugs were 5% of claims.
Most prescribed
- Trazodone Hcl184 claims
- Zolpidem Tartrate78 claims
- Clonazepam63 claims
- Ropinirole Hcl58 claims
- Modafinil52 claims
- Quetiapine Fumarate52 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.
Industry payments in 2024: $604.17
13 payments; by number, the most common kind was food and beverage; the largest payer was Avadel Cns Pharmaceuticals, LLC. The 664 providers of this specialty with any payment received $3,724.37 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.
Sleep Medicine (Internal Medicine) Physician providers in Missouri
There are 17 sleep medicine (internal medicine) physician records in Missouri.
Other sleep medicine (internal medicine) physician records in Missouri
- John Brabson, MDSpringfield, MO1194894337
- Rhody Eisenstein, MDChesterfield, MO1063558948
- Essam Elkady, MDJoplin, MO1124125190
- Rod Elliott-Mullens, DOSaint Louis, MO1447271986
- Joseph Roland Espiritu, MD, MSPHSt Louis, MO1578650362
- Eric Friskel, MDLees Summit, MO1649236647
- Victor Georgiev, MDColumbia, MO1922738400
- Steven Gradney, M.D.Springfield, MO1477743839
- William Graham, M.D.Cape Girardeau, MO1942228028
- Carlos HimplerSaint Louis, MO1295132835
Common questions
What is Anthony Mark Masi, M.D.'s NPI number?
Anthony Mark Masi, M.D.'s National Provider Identifier (NPI) is 1902884844, issued on Dec 31, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Anthony Mark Masi, M.D. located?
The NPPES record lists a practice address at 13975 Manchester RD, Ballwin, MO, 63011. Phone: (636) 391-1222. Providers update this record themselves, so call before visiting.
How can I verify Anthony Mark Masi, M.D.'s license?
NPPES lists Missouri license number R3P21, as entered by the provider. Search the Missouri Board of Registration for the Healing Arts at https://www.fsmb.org/contact-a-state-medical-board/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Anthony Mark Masi, M.D. prescribe under Medicare Part D?
In 2024, Anthony Mark Masi, M.D. had 725 Medicare Part D claims for 135 beneficiaries; the average among sleep medicine (internal medicine) physician prescribers was 585. 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.