William W. Mark, M.D.
Specialist · Cumberland, MD
William W. Mark, M.D. is a specialist with a practice address in Cumberland, Maryland, and NPI 1053498782, issued on Nov 1, 2006. Check the license (Maryland D31221, as entered in NPPES) with the Maryland board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- William W. Mark
- Credential
- M.D.
- Primary taxonomy
- Specialist 174400000X
- License number
- D31221 MD
Self-reported in NPPES; status is on the state search - Practice location
- 224 Washington St, Cumberland, MD 21502
- Phone
- (301) 777-8383
- Enumerated
- Nov 1, 2006
- Record last updated
- Apr 12, 2012 (not updated in 14 years: call before relying on the address or phone)
- Fax
- (301) 777-2780
- Medicaid ID
- 356351100 MD
- Entity
- Type 1 · individual
8 nearest specialist records → All 938 in Maryland → Look up another NPI →
Also registered at 224 Washington St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Denise Bittner, CRNPNurse Practitioner1902983687
Verify William W. Mark in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Maryland board licenses this profession
Search for license D31221Check 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 specialist in 2024
51 Medicare Part D claims, against an average of 1,380 among the 8,233 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of claims.
Most prescribed
- Famotidine22 claims
- Dicyclomine Hcl17 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.
William W. Mark among 938 specialist records in Maryland
William W. Mark, M.D. is one of 938 specialist records with a practice address in Maryland. 36% 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 17% of them.
- NPI issued2006 · 17% of these records are older, 39% newer
- In a Medicare fileYes · 36% of these records are
- In the CMS Doctors and Clinicians fileNo · 23% of these records are
- Record last updated2012 · 72% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 174400000X and a Maryland practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
16 specialist records list a practice address in Cumberland
They are 16 of the 1,070 NPPES records with a practice address in Cumberland, and 938 specialist records in Maryland.
All 938 in Maryland → Every provider in Cumberland → Specialist nationwide →
The 8 specialist records with the nearest ZIP codes
- Brent Biller, CRNACumberland, MD 215021598862906
- George Breza, M.D.Lavale, MD 215021033109822
- Stephen CrosslandCumberland, MD 215021306899141
- Tom Ghobrial, MDCumberland, MD 215021518928746
- Gwyn Harrison, M.D.Cumberland, MD 215021295728327
- George Khachan, M.D.,P.A.Cumberland, MD 215021164454765
- Jong Kim, M.D.Cumberland, MD 215021255334900
- Pradeep Kulkarni, M.D.Cumberland, MD 215021710933148
Common questions
What is William W. Mark, M.D.'s NPI number?
William W. Mark, M.D.'s National Provider Identifier (NPI) is 1053498782, issued on Nov 1, 2006. An NPI identifies a provider in billing; it is not a license.
Where is William W. Mark, M.D. located?
The NPPES record lists a practice address at 224 Washington St, Cumberland, MD, 21502. Phone: (301) 777-8383. Providers update this record themselves, so call before visiting.
How can I verify William W. Mark, M.D.'s license?
NPPES lists Maryland license number D31221, as entered by the provider. Search the Maryland board that licenses this profession; the NPPES record confirms identity only.
How much does William W. Mark, M.D. prescribe under Medicare Part D?
In 2024, William W. Mark, M.D. had 51 Medicare Part D claims; the average among specialist prescribers was 1,380. 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.