Dr. James R. Johnston, MD
- Medicare services, 2024
- 4,483
- Medicare patients, 2024
- 3,024
- MIPS score, 2024
- 88
- Hospital affiliations
- 5
- Industry payments
- $106
- Practice address
- 333 Borthwick Ave, Portsmouth, NH 03801
- Practice phone
- Call (603) 436-5110
- 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. James R. Johnston is a diagnostic radiologist in Portsmouth, New Hampshire
Dr. Johnston practices at Portsmouth Regional Hospital in Portsmouth, New Hampshire, part of HCA Healthcare.
Dr. Johnston's NPI, 1770578742, was assigned on September 15, 2005. Dr. Johnston graduated from Geisel School of Medicine at Dartmouth in 1979. Dr. Johnston holds Massachusetts license 52677.
- NPI
- 1770578742NPI Registry (opens in a new tab)
- Medicare PAC ID
- 7719903830
- NPI enumeration date
- September 15, 2005
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (603) 436-5110
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 73
- Medical school graduation
- 1979
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. James R. Johnston practices at Portsmouth Regional Hospital in Portsmouth, New Hampshire
Dr. Johnston's primary practice is Portsmouth Regional Hospital, at 333 Borthwick Ave, Portsmouth, NH 03801 in Rockingham County. The practice phone is (603) 436-5110.
- Portsmouth Regional Hospital333 Borthwick Ave, Portsmouth, NH 03801 · Rockingham CountyPhone(603) 436-5110
Source: Dmand AI Affiliation Data
Dr. James R. Johnston is affiliated with 6 sites of care and 3 medical groups
Dr. Johnston's primary practice is Portsmouth Regional Hospital in Portsmouth, New Hampshire, part of HCA Healthcare. Dr. Johnston is also affiliated with Wentworth-Douglass Hospital. The medical group on file is Atlantic Radiology. Dmand AI also links Dr. Johnston to 3 more hospitals, 2 medical groups and 1 ambulatory surgery center, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. James R. Johnston's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Johnston practices, 6 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Portsmouth Regional Hospital | Available with a free account |
| +5 more sites and 2 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. James R. Johnston is one of 168 diagnostic radiologists in New Hampshire
Diagnostic radiology is Dr. Johnston's primary specialty in the NPI Registry, under taxonomy code 2085R0202X. Dmand AI has Dr. Johnston's licenses on file in 2 states: Massachusetts and New Hampshire.
Specialties and state licenses
- Diagnostic radiology, MassachusettsPrimary
- New Hampshire license
Diagnostic radiologists near Dr. Johnston
Counts of diagnostic radiologists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. James R. Johnston billed Medicare for 4,483 services in 2024
CMS data shows 4,483 Medicare services from Dr. Johnston across 58 procedure codes in 2024, for 3,024 Medicare patients. Medicare paid $130,499 for them.
Dr. Johnston's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Imaging
- 2023: 3,3972024: 4,39029%
- Other services
- 2023: 672024: 644%
- Tests and treatments
- 2023: 292024: 29No change
Where Dr. Johnston's Medicare services took place, 2024
- In an office58213%
- In a facility3,90187%
Dr. Johnston compared with the New Hampshire median for diagnostic radiologists, 2024
- Dr. Johnston
- New Hampshire median
- Medicare services
- 4,483vs 2,79960% above
- Medicare patients
- 3,024vs 2,03049% above
Medians across 172 diagnostic radiologists in New Hampshire 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. James R. Johnston treated 3,024 Medicare patients in 2024, average age 75
CMS counts 3,024 Medicare patients who saw Dr. Johnston in 2024. The largest group is 65 to 74, with 1,201 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 11% are also on Medicaid. Their average risk score is 1.40, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Johnston's median patient age at 69, with 63% women.
Dr. Johnston's Medicare patients by age, 2024
Dr. Johnston's Medicare patients by sex, 2024
- Women2,01667%
- Men1,00833%
Chronic conditions among Dr. Johnston's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis52%
- Anxiety37%
- Ischemic heart disease31%
- Mood disorders31%
- Chronic kidney disease29%
- Depression28%
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 69
Patient panel by sex, all payers
- Women63%
- Men36%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. James R. Johnston scored 88 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 88 out of 100 for Dr. Johnston for performance year 2024, reported as part of a group. Dr. Johnston accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Dr. Johnston's MIPS scores, performance year 2024
- 88of 100Final score
- 86.2of 100Quality
- 40of 100Improvement Activities
- 77of 100Cost
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026
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Dr. James R. Johnston received $106 in industry payments from 2016 to 2020
CMS Open Payments shows 2 general payments to Dr. Johnston from 2 drug and device companies from 2016 to 2020. Food and beverage make up the largest share, 100% of the total. Medtronic USA, Inc. paid the most, $80.
General payments to Dr. Johnston by program year, 2016 to 2020
Companies that paid Dr. Johnston the most, 2016 to 2020
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. James R. Johnston graduated from Geisel School of Medicine at Dartmouth
Dr. Johnston graduated from Geisel School of Medicine at Dartmouth in 1979.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. James R. 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) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Clinician Public Reporting: Overall MIPS Performance (CMS) (opens in a new tab) |
| 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. James R. 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. James R. Johnston's NPI number?
Dr. James R. Johnston's NPI number is 1770578742. It was assigned on September 15, 2005, and it is active in the NPI Registry.
What kind of doctor is Dr. James R. Johnston?
Dr. James R. Johnston is a diagnostic radiologist in Portsmouth, New Hampshire. The primary specialty in the NPI Registry is Diagnostic Radiology Physician (taxonomy code 2085R0202X).
Where does Dr. James R. Johnston practice?
Dr. Johnston practices at 333 Borthwick Ave, Portsmouth, NH 03801. Dr. Johnston's primary practice is Portsmouth Regional Hospital in Portsmouth, New Hampshire, part of HCA Healthcare. Dmand AI also links Dr. Johnston to 3 hospitals, 2 medical groups and 1 ambulatory surgery center.
What is Dr. James R. Johnston's office phone number?
The practice phone on file for Dr. Johnston is (603) 436-5110.
What is Dr. James R. Johnston's medical license number?
Dr. Johnston holds Massachusetts license 52677, one of the licenses on file in 2 states.
Which states has Dr. James R. Johnston been licensed in?
Dmand AI has state licenses on file for Dr. Johnston in Massachusetts and New Hampshire.
Which hospitals is Dr. James R. Johnston affiliated with?
Dr. Johnston practices at Portsmouth Regional Hospital in Portsmouth, New Hampshire. Dr. Johnston is also affiliated with Wentworth-Douglass Hospital. Dmand AI links Dr. Johnston to 3 more hospitals.
What medical group is Dr. James R. Johnston part of?
Dr. Johnston is linked to Atlantic Radiology. Dmand AI links Dr. Johnston to 2 more medical groups.
Does Dr. James R. Johnston accept Medicare?
Yes. CMS data shows Dr. Johnston billed Medicare for 4,483 services in 2024, and Dr. Johnston accepts Medicare assignment.
What is Dr. James R. Johnston's MIPS score?
Dr. Johnston's MIPS final score for performance year 2024 is 88 out of 100, reported as part of a group.
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How many Medicare patients does Dr. James R. Johnston see?
CMS counts 3,024 Medicare patients who saw Dr. Johnston in 2024, with an average age of 75.
What services does Dr. James R. Johnston bill to Medicare?
In 2024, Dr. Johnston's most billed Medicare services were diagnostic imaging (71045), radiation oncology (77063) and radiation oncology (77067).
Where did Dr. James R. Johnston go to medical school?
Dr. Johnston graduated from Geisel School of Medicine at Dartmouth in 1979.
Has Dr. James R. Johnston received payments from drug or device companies?
CMS Open Payments shows $106 in general payments to Dr. Johnston from 2 companies from 2016 to 2020. The largest total came from Medtronic USA, Inc.
How long has Dr. James R. Johnston been practicing?
Dr. Johnston graduated from medical school in 1979, 47 years ago.
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