Carl Johnson, MD
Carl Johnson is an Internal Medicine specialist based in Largo, MD with over 35 years of clinical experience. Medicare-enrolled per CMS records and offers virtual telehealth visits.
Carl Johnson, MD has practiced internal medicine for 35+ years, working in group practice. He graduated from George Washington University School of Medicine in 1991 and has 35+ years of clinical experience. Among his Medicare patients, common conditions include hypertension, high cholesterol, and diabetes (per CMS data).
At a glance
- Prescribes opioids less than 43% of reporting doctors in Maryland
- Uses generic medications more than 49% of reporting doctors in Maryland
- Virtual visits available — no app or travel required
Older · 6894dNPPES updated 2007-07-08 · verify NPI on CMS · Verify license at Maryland Board of Physicians
Contact & Location
Practice Location
1221 Mercantile Lane, Largo, MD 20774-5374
How Does This Doctor Compare?
Based on Medicare data, this doctor prescribes opioid pain medications conservatively, favors affordable generic drugs over brand-name ones.
Opioid Rx
↓ Lower = better0.9%
Maryland avg: 4.4 · US avg: 5.1
✓ Higher than most doctors nationally(-4.2 pts)
Typical range among reporting doctors in Maryland0.9% of this doctor's prescriptions are opioid pain medications. Lower means more cautious prescribing.
Generic Rx
↑ Higher = better88%
Maryland avg: 83.4 · US avg: 82.8
✓ Higher than most doctors nationally(+5.2 pts)
Typical range among reporting doctors in MarylandHow often this doctor prescribes affordable generic drugs instead of expensive brand-name ones.
Medicare Patients
374
Unique beneficiaries
Standard volumePrescription Recipients
246
Patients prescribed
Prescriptions Written
2,452
Total claims
Total Medicare drug cost: $275k
Percentile rankings compared against 2,391 reporting peers in Maryland.
Data Note: Sourced from CMS Medicare Provider Utilization & Payment Data. Percentile rankings compare this provider against all peers with reported data in the same state. Updated annually to reflect the latest federal reporting cycle.
What This Doctor Treats Most
Based on Medicare claims data — here's what patients commonly see this doctor for
Based on Medicare data, this doctor primarily manages Hypertension, High Cholesterol, and Diabetes.
High blood pressure — a leading risk factor for heart disease and stroke
US avg: 70.2%↑ More patients than average (+5%) — a focus area for this doctor
Elevated cholesterol or triglycerides that increase heart disease risk
US avg: 70.4%↓ Fewer patients than average (-3%) — less common here
A condition where the body cannot properly regulate blood sugar levels
US avg: 34.5%↑ More patients than average (+25%) — a focus area for this doctor
Joint inflammation causing pain, swelling, and stiffness
US avg: 49.3%↓ Fewer patients than average (-4%) — less common here
Gradual loss of kidney function over time, often linked to diabetes or hypertension
US avg: 29.6%↓ Fewer patients than average (-5%) — less common here
Reduced blood flow to the heart muscle, commonly known as coronary artery disease
US avg: 31.7%↓ Fewer patients than average (-12%) — less common here
Percentage of this provider's Medicare patients diagnosed with each condition. Source: CMS Utilization Data.
$20 received from industry
1 transaction reported in 2024 ·Low tier
Payments include consulting fees, speaking honoraria, food & beverage, travel, research support, and ownership interests from drug and medical device manufacturers. Disclosure is required by the federal Physician Payments Sunshine Act. These payments do not necessarily indicate conflicts of interest. National median: $338 across 136 000 tracked providers.
Tiers — Low: under $500 · Moderate: $500-5 000 · High: $5 000-25 000 · Very High: $25 000+. Source: CMS Open Payments 2024, attributed to Carl Johnson's NPI.
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Background & Specialty
Education, training, and specialty classification from CMS NPPES and Medicare records.
Graduated medical school · 1991
George Washington University School of Medicine and Health Sciences
35 years in practice
Senior practitioner
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
Taxonomy: 207R00000X
Education & Training
George Washington University School of Medicine (Class of 1991)
Mailing address
Kaiser Permanente Mid Atlantic Permanente Medical Group 2101 E Jefferson St Ppqa Medicare Compliance Unit 6 W, Rockville, MD 20852-4908
Differs from practice location
Primary hospital affiliation: Acute Care Hospitals
CMS Certification Number: 500027
View hospital on Medicare Care CompareVirtual Internal Medicine Care With Carl Johnson
NPPES records indicate this provider offers telehealth services. Contact the office to confirm availability and scheduling.
Schedule a virtual visit with Carl Johnson for blood pressure monitoring, cholesterol management, diabetes check-ins — no travel to Largo required. The office sends a secure video link before your appointment. Most visits take 15–30 minutes. Medicare enrolled per CMS records.
Frequently Asked Questions
Common questions about Carl Johnson
NPI records show Dr. Johnson as active with telehealth listed in Largo, MD. NPI status alone doesn't confirm open availability — call the office to confirm. Phone: (301) 618-5540.
Sourced from CMS NPPES · OIG LEIE · CMS Medicare Part D · CMS Open Payments 2024 · CMS Physician Comparator. See Data Methodology.
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Contact Carl Johnson
Practice Location
1221 Mercantile Lane, Largo, MD 20774-5374
Mailing Address
Kaiser Permanente Mid Atlantic Permanente Medical Group 2101 E Jefferson St Ppqa Medicare Compliance Unit 6 W, Rockville, MD 20852-4908
This is a provider directory. Contact the office directly to schedule appointments.
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