Carl Johnson, MD
Internal Medicine Physician · Largo, MD
Carl Johnson, MD is an internal medicine physician with a practice address in Largo, Maryland, and NPI 1205994266, issued on Dec 4, 2006. Check the license (Maryland D45881, as entered in NPPES) on the Maryland Board of Physicians; the Medicare figures below come from public CMS files.
- Name
- Carl Johnson
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- D45881 MD
Self-reported in NPPES; status is on the state search - Practice location
- 1221 Mercantile Lane, Largo, MD 20774
- Phone
- (301) 618-5540
- Enumerated
- Dec 4, 2006
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (301) 618-5525
- Medicare enrollment
- Enrolled (PECOS I20191105001448); accepts Medicare assignment
- Medical or professional school
- George Washington University School Of Medicine, 1991
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 3,904 in Maryland → Look up another NPI →
Also registered at 1221 Mercantile Lane
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Carl Johnson in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMaryland Board of Physicians
Search for license D45881Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
43% more Medicare Part D claims than the average internal medicine physician in 2024
4,546 Medicare Part D claims for 535 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 10% of claims. 34 claims were for opioids.
Most prescribed
- Atorvastatin Calcium403 claims
- Amlodipine Besylate382 claims
- Hydrochlorothiazide169 claims
- Metformin Hcl134 claims
- Lisinopril120 claims
- Losartan Potassium115 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: $19.78
1 payment: food and beverage; the largest payer was Hologic Sales and Service, LLC. 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 one group practice
- Medstar Medical Group II LLCWashington, DC
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Carl Johnson among 3,904 internal medicine physician records in Maryland
Carl Johnson, MD 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 2006, is newer than 9% of them.
- NPI issued2006 · 9% of these records are older, 55% newer
- In a Medicare fileYes · 77% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated1991 · median 2003 among the 2,445 with a school on file
- Record last updated2007 · 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).
36 internal medicine physician records list a practice address in Largo
They are 36 of the 651 NPPES records with a practice address in Largo, and 3,904 internal medicine physician records in Maryland.
All 3,904 in Maryland → Every provider in Largo → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Cielito Aguinaldo, MDLargo, MD 207741063585347
- Elizabeth Biru, MDLargo, MD 207741457342230
- Doreen Blake, M.D.Largo, MD 207741043209331
- George Bone, MDLargo, MD 207741528028297
- Anita Clayton, MDLargo, MD 207741598838872
- Olumide Coker, M.D.Largo, MD 207741235171885
- Glen Jacob, MDLargo, MD 207741780757062
- Ejaz Khan, MDUpper Marlboro, MD 207741669416160
Common questions
What is Carl Johnson, MD's NPI number?
Carl Johnson, MD's National Provider Identifier (NPI) is 1205994266, issued on Dec 4, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Carl Johnson, MD located?
The NPPES record lists a practice address at 1221 Mercantile Lane, Largo, MD, 20774. Phone: (301) 618-5540. Providers update this record themselves, so call before visiting.
How can I verify Carl Johnson, MD's license?
NPPES lists Maryland license number D45881, 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 Carl Johnson, MD prescribe under Medicare Part D?
In 2024, Carl Johnson, MD had 4,546 Medicare Part D claims for 535 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.