Calvin William Parker, M.D.
Internal Medicine Physician · Baltimore, MD
Calvin William Parker, M.D. is an internal medicine physician with a practice address in Baltimore, Maryland, and NPI 1073654976, issued on Feb 12, 2007. Check the license (Maryland D81266, as entered in NPPES) on the Maryland Board of Physicians; the Medicare figures below come from public CMS files.
- Name
- Calvin William Parker
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- D81266 MD
057556 GA
Self-reported in NPPES; status is on the state search - Practice location
- 1838 Greene Tree RD, Baltimore, MD 21208
- Phone
- (410) 602-7782
- Enumerated
- Feb 12, 2007
- Record last updated
- Mar 9, 2022
- Fax
- (410) 602-2438
- Medicare enrollment
- Enrolled (PECOS I20160720002247); may accept Medicare assignment
- Medical or professional school
- Howard University College Of Medicine, 2004
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 3,904 in Maryland → Look up another NPI →
Also registered at 1838 Greene Tree RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Calvin William Parker in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMaryland Board of Physicians
Search for license D81266Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
84% fewer Medicare Part D claims than the average internal medicine physician in 2024
510 Medicare Part D claims for 258 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 21% of claims.
Most prescribed
- Pantoprazole Sodium159 claims
- Sod Sulf-Potass Sulf-Mag Sulf103 claims
- Dicyclomine Hcl26 claims
- Linzess22 claims
- Omeprazole15 claims
- Gavilyte-G14 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 practice group's MIPS final score for 2023 (Medicare payment program): 84.8 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. 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, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $1,341.56
77 payments; by number, the most common kind was food and beverage; the largest payer was Abbvie Inc. The 50,334 providers of this specialty with any payment received $1,303.06 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.
Bills Medicare through 2 group practices
- Lifebridge Community Gastroenterology LLCGlen Burnie, MD
- Sinai Hospital OF Baltimore, IncBaltimore, MD
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Calvin William Parker among 3,904 internal medicine physician records in Maryland
Calvin William Parker, M.D. is one of 3,904 internal medicine physician records with a practice address in Maryland. 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 45% of them.
- NPI issued2007 · 45% of these records are older, 44% newer
- In a Medicare fileYes · 77% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated2004 · median 2003 among the 2,445 with a school on file
- Record last updated2022 · 59% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Maryland practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
1,278 internal medicine physician records list a practice address in Baltimore
They are 1,278 of the 35,183 NPPES records with a practice address in Baltimore, and 3,904 internal medicine physician records in Maryland.
All 3,904 in Maryland → Every provider in Baltimore → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Karen Babitt, MDBaltimore, MD 212081073583787
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- Jerome Ginsberg, MDPikesville, MD 212081023087061
- Craig Gold, M.D.Pikesville, MD 212081164488292
- Michaelle Halaby Holmes, MDPikesville, MD 212081932105137
- John Lah, M.D.11Pikesville, MD 212081215994272
- Jacob Levine, M.D.Pikesville, MD 212081396784245
- Steven Miller, M.D.Pikesville, MD 212081003874355
Common questions
What is Calvin William Parker, M.D.'s NPI number?
Calvin William Parker, M.D.'s National Provider Identifier (NPI) is 1073654976, issued on Feb 12, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Calvin William Parker, M.D. located?
The NPPES record lists a practice address at 1838 Greene Tree RD, Baltimore, MD, 21208. Phone: (410) 602-7782. Providers update this record themselves, so call before visiting.
How can I verify Calvin William Parker, M.D.'s license?
NPPES lists Maryland license number D81266, as entered by the provider. Search the Maryland Board of Physicians at https://www.mbp.state.md.us/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Calvin William Parker, M.D. prescribe under Medicare Part D?
In 2024, Calvin William Parker, M.D. had 510 Medicare Part D claims for 258 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Calvin William Parker, M.D.'s MIPS final score?
The 2023 MIPS final score is 84.8 of 100, reported for the practice group. 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.