J Am Acad Orthop Surg
Arthroplasty, Replacement, ShoulderGlenoid CavityProsthesis Design
Dr. Peter Shay Johnston, MD
NPI1194946095PAC ID6507037652
- Medicare services, 2024
- 3,265
- Medicare patients, 2024
- 975
- Part D claims, 2024
- 64
- Publications
- 17
- Hospital affiliations
- 1
- Practice address
- 25500 Point Lookout Road, Leonardtown, MD 20650
- Practice phone
- Call (301) 475-6001
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Johnston's professional email, personal email and mobile number
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Dr. Peter Shay Johnston is an orthopedic surgeon in Leonardtown, Maryland
Dr. Johnston practices at MedStar St. Mary's Hospital in Leonardtown, Maryland, part of MedStar Health.
Dr. Johnston's NPI, 1194946095, was assigned on May 1, 2007. Dr. Johnston graduated from Wayne State University School of Medicine in 2005. Dr. Johnston holds Maryland license D0072342.
NPI and contact details
- NPI
- 1194946095NPI Registry (opens in a new tab)
- Medicare PAC ID
- 6507037652
- NPI enumeration date
- May 1, 2007
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (301) 475-6001
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 47
- Medical school graduation
- 2005
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Peter Shay Johnston practices at MedStar St. Mary's Hospital in Leonardtown, Maryland
Dr. Johnston's primary practice is MedStar St. Mary's Hospital, at 25500 Point Lookout Road, Leonardtown, MD 20650 in St. Marys County. The practice phone is (301) 475-6001.
- MedStar St. Mary's Hospital25500 Point Lookout Road, Leonardtown, MD 20650 · St. Marys CountyPhone(301) 475-6001
Source: Dmand AI Affiliation Data
Dr. Peter Shay Johnston is affiliated with 3 sites of care and 1 medical group
Dr. Johnston's primary practice is MedStar St. Mary's Hospital in Leonardtown, Maryland, part of MedStar Health. The medical group on file is The Centers for Advanced Orthopaedics. Dmand AI also links Dr. Johnston to 1 more group practice or clinic and 1 home health agency, each named with a free account.
The Centers for Advanced Orthopaedics1 group practice or clinicName with a free account1 home health agencyName with a free account
See all 4 affiliations for Dr. JohnstonSources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Peter Shay Johnston's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Johnston practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| MedStar St. Mary's Hospital | Available with a free account |
| +2 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Peter Shay Johnston is one of 404 orthopedic surgeons in Maryland
Orthopaedic surgery is Dr. Johnston's primary specialty in the NPI Registry, under taxonomy code 207X00000X. Dr. Johnston is licensed in Maryland.
Specialties and state licenses
- Orthopaedic surgery, MarylandPrimary
Orthopedic surgeons near Dr. Johnston
Counts of orthopedic surgeons with a Dmand AI profile, by place and practice. Each opens the list.
404orthopedic surgeons in Maryland
4orthopedic surgeons in Leonardtown
2orthopedic surgeons at MedStar St. Mary's HospitalSources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Peter Shay Johnston billed Medicare for 3,265 services in 2024
CMS data shows 3,265 Medicare services from Dr. Johnston across 22 procedure codes in 2024, for 975 Medicare patients. Medicare paid $244,255 for them.
Medicare services, 20243,265
Medicare patients975
Paid by Medicare$244,255
Procedure codes22
Dr. Johnston's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Imaging
- 2023: 1,3392024: 1,2854%
- Office and hospital visits
- 2023: 9702024: 77820%
- Drugs given in the office
- 2023: 8482024: 64025%
- Surgery
- 2023: 4432024: 4303%
- Tests and treatments
- 2023: 4112024: 13268%
Where Dr. Johnston's Medicare services took place, 2024
- In an office2,98992%
- In a facility2768%
Dr. Johnston compared with the Maryland median for orthopedic surgeons, 2024
- Dr. Johnston
- Maryland median
- Medicare services
- 3,265vs 1,3432.4 times
- Medicare patients
- 975vs 3432.8 times
- Part D claims
- 15vs 9083% below
Medians across 368 orthopedic surgeons in Maryland with Dmand AI profiles that report each measure.
Dr. Johnston's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Peter Shay Johnston treated 975 Medicare patients in 2024, average age 74
CMS counts 975 Medicare patients who saw Dr. Johnston in 2024. The largest group is 65 to 74, with 502 patients. 75% of them have arthritis, and 75% have high blood pressure. 6% are also on Medicaid. Their average risk score is 1.01, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Johnston's median patient age at 61, with 49% women.
Medicare patients, 2024975
Average age74
Average risk score1.01
Also on Medicaid6%
Dr. Johnston's Medicare patients by age, 2024
Dr. Johnston's Medicare patients by sex, 2024
- Women57659%
- Men39941%
Chronic conditions among Dr. Johnston's Medicare patients, 2024
- Arthritis75%
- High blood pressure75%
- High cholesterol75%
- Diabetes34%
- Ischemic heart disease28%
- Anxiety22%
- Chronic kidney disease20%
- Mood disorders19%
Share of Medicare patients with each condition. A patient can have several.
Dr. Johnston's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 61
Patient panel by sex, all payers
- Women49%
- Men50%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Peter Shay Johnston wrote 64 Medicare Part D claims in 2024
In 2024, Dr. Johnston wrote 64 Medicare Part D claims for 40 patients. 100% of them were for generic drugs. CMS names the drug for 15 of them, across 1 drug with 11 or more claims each, at $113 in total drug cost. In 2023, CMS named 49 claims across 4 drugs.
Part D claims, 202464
Drugs named by CMS1
Total drug cost$113
Part D patients40
Dr. Johnston's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 492024: 1569%
Drugs named by CMS: 1 in 2024, 4 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
Dr. Peter Shay Johnston ranks in the 89th percentile for upper limb (arm) arthroscopy (minimally invasive joint repair) in Medicare
Dr. Johnston accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS counts 59 procedures of upper limb (arm) arthroscopy (minimally invasive joint repair) by Dr. Johnston, more than 89% of the clinicians it reports for that procedure.
- Accepts Medicare assignment
- Yes
Where Dr. Johnston ranks in Medicare procedure volume
- Upper limb (arm) arthroscopy (minimally invasive joint repair)
- 89th percentile59 procedures
CMS ranks each clinician against every clinician it reports for the same procedure category.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Doctors and Clinicians Utilization Data (CMS)
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Dr. Peter Shay Johnston has 17 publications on record
Dmand AI links 17 papers to Dr. Johnston, published from 2017 to 2024. 2022 was the busiest year, with 4. The most frequent topics are Shoulder Joint, Arthroplasty, Replacement, Shoulder and Glenoid Cavity. Dr. Johnston has published most often in J Am Acad Orthop Surg. Dr. Johnston's most frequent co-authors are Benjamin William Sears, Robert James Gillespie, MD and Grant Edward Garrigues, MD.
Papers17
Years published2017 to 2024
Dr. Johnston's papers by year, 2017 to 2024
Topics Dr. Johnston writes about most
- Shoulder Joint
- Arthroplasty, Replacement, Shoulder
- Glenoid Cavity
- Osteoarthritis
- Range of Motion, Articular
- Prosthesis Design
- Radiography
- Shoulder Prosthesis
Dr. Johnston's most frequent co-authors
- Benjamin William Sears8 shared papers
- Robert James Gillespie, MD5 shared papers
- Grant Edward Garrigues, MD3 shared papers
Recent publications by Dr. Johnston
J Shoulder Elbow Surg
Arthroplasty, Replacement, ShoulderGlenoid CavityProsthesis Design
J Am Acad Orthop Surg Glob Res Rev
Arthroplasty, Replacement, ShoulderOsteoarthritisPeriprosthetic Fractures
Arthroplasty, Replacement, ShoulderGlenoid CavityJoint Dislocations
See who Dr. Johnston researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Johnston works with, so you can find a warm path to the right orthopedic surgeons.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Peter Shay Johnston received $802,159 in industry payments from 2016 to 2025
CMS Open Payments shows 411 general payments to Dr. Johnston from 20 drug and device companies from 2016 to 2025. Consulting fees make up the largest share, 47% of the total. Shoulder Innovations, Inc. paid the most, $665,045.
General payments to Dr. Johnston by program year, 2016 to 2025
General payments to Dr. Johnston by kind, 2016 to 2025
$802.2Kin total
- Consulting fees$376,93847%
- Royalties and licenses$346,63543%
- Speaker and faculty fees$32,8394%
- Travel and lodging$31,4094%
- Other$13,8122%
Companies that paid Dr. Johnston the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Peter Shay Johnston graduated from Wayne State University School of Medicine
Dr. Johnston graduated from Wayne State University School of Medicine in 2005.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Peter Shay Johnston's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Doctors and Clinicians Utilization Data (CMS) (opens in a new tab) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Peter Shay Johnston
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Peter Shay Johnston's NPI number?
Dr. Peter Shay Johnston's NPI number is 1194946095. It was assigned on May 1, 2007, and it is active in the NPI Registry.
What kind of doctor is Dr. Peter Shay Johnston?
Dr. Peter Shay Johnston is an orthopedic surgeon in Leonardtown, Maryland. The primary specialty in the NPI Registry is Orthopaedic Surgery Physician (taxonomy code 207X00000X).
Where does Dr. Peter Shay Johnston practice?
Dr. Johnston practices at 25500 Point Lookout Road, Leonardtown, MD 20650. Dr. Johnston's primary practice is MedStar St. Mary's Hospital in Leonardtown, Maryland, part of MedStar Health. Dmand AI also links Dr. Johnston to 1 group practice or clinic and 1 home health agency.
What is Dr. Peter Shay Johnston's office phone number?
The practice phone on file for Dr. Johnston is (301) 475-6001.
What is Dr. Peter Shay Johnston's medical license number?
Dr. Johnston holds Maryland license D0072342.
Which hospitals is Dr. Peter Shay Johnston affiliated with?
Dr. Johnston practices at MedStar St. Mary's Hospital in Leonardtown, Maryland.
What medical group is Dr. Peter Shay Johnston part of?
Dr. Johnston is linked to The Centers for Advanced Orthopaedics.
Does Dr. Peter Shay Johnston accept Medicare?
Yes. CMS data shows Dr. Johnston billed Medicare for 3,265 services in 2024, and Dr. Johnston accepts Medicare assignment.
How many Medicare patients does Dr. Peter Shay Johnston see?
CMS counts 975 Medicare patients who saw Dr. Johnston in 2024, with an average age of 74.
What services does Dr. Peter Shay Johnston bill to Medicare?
In 2024, Dr. Johnston's most billed Medicare services were diagnostic imaging (73030), injected or infused drug (J3301) and office visit, established patient (99213).
Show 6 more questionsShow fewer questions
Where did Dr. Peter Shay Johnston go to medical school?
Dr. Johnston graduated from Wayne State University School of Medicine in 2005.
What drugs does Dr. Peter Shay Johnston prescribe most?
In 2024 Medicare Part D data, Dr. Johnston's most prescribed drugs by claims were Methylprednisolone.
Has Dr. Peter Shay Johnston received payments from drug or device companies?
CMS Open Payments shows $802,159 in general payments to Dr. Johnston from 20 companies from 2016 to 2025. The largest total came from Shoulder Innovations, Inc.
How long has Dr. Peter Shay Johnston been practicing?
Dr. Johnston graduated from medical school in 2005, 21 years ago.
Does Dr. Peter Shay Johnston do research?
Dmand AI links 17 publications to Dr. Johnston, published from 2017 to 2024.
Who does Dr. Peter Shay Johnston publish with?
Dr. Johnston's most frequent co-authors are Benjamin William Sears (8 shared papers), Robert James Gillespie, MD (5 shared papers) and Grant Edward Garrigues, MD (3 shared papers).
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