Dr. Aaron J. Johnson, MD
Orthopedic Surgery (Orthopaedic Surgery Physician)
22 S Greene St
Baltimore, MD 21201
Who else practices at this address →
Baltimore city includes primary care (36% of residents) shortage areas. About shortage areas
- Medicare participating
At a glance
- Medical school
- University of Maryland School of Medicine (2009)
- Years since graduation
- 17
- In the NPI registry since
- 2012
- Medicare patients seen, 2024
- 387
The NPI date is when this clinician registered for a National Provider Identifier, the billing number used on health claims. It is not a license, graduation or board-certification date. What an NPI is
Education and training
- 2009Medical school: University of Maryland School of Medicine
- 2012Registered with an NPI (national billing number; not a license date)
Undergraduate school, residency, fellowship, licensing exams and board certification aren’t in public federal data. Board certification can be confirmed with the certifying board (ABMS member boards for MDs, AOA boards for DOs).
Specialties and state licenses
-
Orthopaedic Surgery Physician primary
MD license D85157 -
Orthopaedic Trauma Physician
MD license D85157
As reported to the NPI registry. To confirm a license is current, check the state medical board.
Where they work
Hospitals
- University of Maryland Medical Center Baltimore, MD
- University of MD Baltimore Washington Medical Center Glen Burnie, MD
- University of MD Capital Region Medical Center Upper Marlboro, MD
Medical groups
- Meritus Medical Center Inc (743 clinicians)
- University of Maryland Community Medical Group Inc (477 clinicians)
- University of Maryland Orthopaedic Associates PA (67 clinicians)
- University of Maryland Orthopaedic Trauma Associates, P.a. (41 clinicians)
Hospitals this clinician lists with Medicare, and groups they bill Medicare through (Care Compare). Affiliation doesn’t mean they see patients at every location.
Medicare patients and services
- Medicare patients, 2024
- 387
- Services billed
- 1,920
- Patients’ average age
- 72
| Service | Times | Patients |
|---|---|---|
| Established patient office or other outpatient visit, 40-54 minutes | 349 | 233 |
| Injection, triamcinolone acetonide, not otherwise specified, 10 mg | 326 | 33 |
| Established patient office or other outpatient visit, 30-39 minutes | 153 | 126 |
| Aspiration and/or injection of fluid from large joint | 147 | 90 |
| X-ray of hip, 2-3 views | 94 | 49 |
| X-ray of knee, 1-2 views | 71 | 38 |
| X-ray of both knees while standing | 52 | 35 |
| Replacement of thigh bone and hip joint with prosthesis | 45 | 41 |
| Replacement of knee joint, both sides of knee | 34 | 31 |
| Established patient office or other outpatient visit, 20-29 minutes | 20 | 18 |
Medicare fee-for-service only. CMS leaves out services billed for fewer than 11 patients. These figures describe a practice’s Medicare work; they aren’t a measure of quality.
Medicare prescriptions
| Drug | Prescriptions |
|---|---|
| Meloxicam Other prescribers in Baltimore, MD | 48 |
| Amoxicillin Other prescribers in Baltimore, MD | 29 |
| Mupirocin Other prescribers in Baltimore, MD | 11 |
Prescriptions filled under Medicare Part D, including refills. CMS leaves out drugs prescribed fewer than 11 times.
Payments from drug and device companies
In 2025, 3 companies reported 11 payments worth $14,458 in total to this clinician.
| Medical Device Business Services, Inc. | $13,362 |
|---|---|
| Synthes GmbH | $1,000 |
| Zimmer Biomet Holdings, Inc. | $95.30 |
| Consulting Fee | $12,100 |
|---|---|
| Travel and Lodging | $1,014 |
| Speaking at a medical education program | $1,000 |
| Food and Beverage | $344 |
What the payments were for
| Company | What it was for | Amount |
|---|---|---|
| Medical Device Business Services, Inc. Oct 23, 2025 | Consulting Fee | $12,100 |
| Medical Device Business Services, Inc. Sep 4, 2025 | Travel and Lodging ATTUNE · Ortho-Knee · travel to LAS VEGAS, NV · in-kind | $766 |
| Synthes GmbH Aug 26, 2025 | Speaking at a medical education programCompany’s descriptionINDIRECT VALUE TRANSFER | $500 |
| Synthes GmbH Feb 25, 2025 | Speaking at a medical education programCompany’s descriptionINDIRECT VALUE TRANSFER | $500 |
| Medical Device Business Services, Inc. Sep 4, 2025 | Travel and Lodging ATTUNE · Ortho-Knee · travel to LAS VEGAS, NV · in-kind | $248 |
Each payment as the company reported it, with the products it named. Meals are counted in the totals above but not listed one by one.
From CMS Open Payments. A payment is not evidence of wrongdoing; many are for consulting, teaching or meals. Clinicians can review and dispute their records with CMS.