Dr. James Byron Darnton, MD
- Medicare services, 2024
- 110
- Medicare patients, 2024
- 52
- Part D claims, 2024
- 2,485
- MIPS score, 2024
- 94
- Hospital affiliations
- 2
- Practice address
- 325 9th Avenue, Seattle, WA 98104
- Practice phone
- Call (206) 744-9535
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Darnton's professional email, personal email and mobile number
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Dr. James Byron Darnton is an internist in Seattle, Washington
Dr. Darnton practices at Harborview Medical Center in Seattle, Washington, part of University of Washington.
Dr. Darnton's NPI, 1396087227, was assigned on March 18, 2013. Dr. Darnton graduated from Perelman School of Med at the University of Pennsylvania in 2013. Dr. Darnton holds Washington license ML 60358691.
- NPI
- 1396087227NPI Registry (opens in a new tab)
- Medicare PAC ID
- 2860717618
- NPI enumeration date
- March 18, 2013
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (206) 744-9535
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 39
- Medical school graduation
- 2013
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. James Byron Darnton practices at Harborview Medical Center in Seattle, Washington
Dr. Darnton's primary practice is Harborview Medical Center, at 325 9th Avenue, Seattle, WA 98104 in King County. The practice phone is (206) 744-9535.
- Harborview Medical Center325 9th Avenue, Seattle, WA 98104 · King CountyPhone(206) 744-9535
Source: Dmand AI Affiliation Data
Dr. James Byron Darnton is affiliated with 2 sites of care and 1 medical group
Dr. Darnton's primary practice is Harborview Medical Center in Seattle, Washington, part of University of Washington. The medical group on file is UW Physicians. Dmand AI also links Dr. Darnton to 1 more hospital, 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 Byron Darnton's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Darnton practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Harborview Medical Center | Available with a free account |
| +1 more affiliated site | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. James Byron Darnton is one of 2,689 internists in Washington
Internal medicine is Dr. Darnton's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Darnton is licensed in Washington.
Specialties and state licenses
- Internal medicine, WashingtonPrimary
Internists near Dr. Darnton
Counts of internists 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 Byron Darnton billed Medicare for 110 services in 2024
CMS data shows 110 Medicare services from Dr. Darnton across 3 procedure codes in 2024, for 52 Medicare patients. Medicare paid $4,779 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Darnton's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 872024: 6822%
- Other services
- 2023: 02024: 42
Dr. Darnton compared with the Washington median for internists, 2024
- Dr. Darnton
- Washington median
- Medicare services
- 110vs 36470% below
- Medicare patients
- 52vs 16568% below
- Part D claims
- 1,953vs 18210.7 times
Medians across 2,604 internists in Washington with Dmand AI profiles that report each measure.
Dr. Darnton'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 Byron Darnton treated 52 Medicare patients in 2024, average age 67
CMS counts 52 Medicare patients who saw Dr. Darnton in 2024. The largest group is 65 to 74, with 25 patients. 75% of them have high blood pressure, and 42% have diabetes. 56% are also on Medicaid. Their average risk score is 1.25, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Darnton's median patient age at 60, with 40% women.
Dr. Darnton's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Darnton's Medicare patients by sex, 2024
- Women2854%
- Men2446%
Chronic conditions among Dr. Darnton's Medicare patients, 2024
- High blood pressure75%
- Diabetes42%
- Mood disorders40%
- Depression35%
- High cholesterol35%
- Arthritis31%
- Chronic kidney disease23%
Share of Medicare patients with each condition. A patient can have several.
Dr. Darnton's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 60
Patient panel by sex, all payers
- Women40%
- Men60%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. James Byron Darnton wrote 2,485 Medicare Part D claims in 2024
In 2024, Dr. Darnton wrote 2,485 Medicare Part D claims for 108 patients. 83% of them were for generic drugs. CMS names the drug for 1,953 of them, across 64 drugs with 11 or more claims each, at $185,108 in total drug cost. In 2023, CMS named 1,962 claims across 64 drugs.
Dr. Darnton's Part D claims by kind of drug, 2024
- Generic2,073 claims83%
- Brand-name361 claims15%
- Other51 claims2%
Dr. Darnton'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.
Drug classes CMS tracks in Dr. Darnton's Part D claims, 2024
- Opioids8%204 of 2,485 claims
- Antibiotics1%14 of 2,485 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 1,9622024: 1,953No change
Drugs named by CMS: 64 in 2024, 64 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. James Byron Darnton scored 94 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 94 out of 100 for Dr. Darnton for performance year 2024, reported through an alternative payment model (APM). Dr. Darnton accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Dr. Darnton's MIPS scores, performance year 2024
- 94of 100Final score
- 74.6of 100Quality
- 100of 100Promoting Interoperability
- 40of 100Improvement Activities
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 Byron Darnton graduated from Perelman School of Med at the University of Pennsylvania
Dr. Darnton graduated from Perelman School of Med at the University of Pennsylvania in 2013.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. James Byron Darnton'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)Clinician Public Reporting: Overall MIPS Performance (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 Byron Darnton
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 Byron Darnton's NPI number?
Dr. James Byron Darnton's NPI number is 1396087227. It was assigned on March 18, 2013, and it is active in the NPI Registry.
What kind of doctor is Dr. James Byron Darnton?
Dr. James Byron Darnton is an internist in Seattle, Washington. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. James Byron Darnton practice?
Dr. Darnton practices at 325 9th Avenue, Seattle, WA 98104. Dr. Darnton's primary practice is Harborview Medical Center in Seattle, Washington, part of University of Washington. Dmand AI also links Dr. Darnton to 1 hospital.
What is Dr. James Byron Darnton's office phone number?
The practice phone on file for Dr. Darnton is (206) 744-9535.
What is Dr. James Byron Darnton's medical license number?
Dr. Darnton holds Washington license ML 60358691.
Which hospitals is Dr. James Byron Darnton affiliated with?
Dr. Darnton practices at Harborview Medical Center in Seattle, Washington. Dmand AI links Dr. Darnton to 1 more hospital.
What medical group is Dr. James Byron Darnton part of?
Dr. Darnton is linked to UW Physicians.
Does Dr. James Byron Darnton accept Medicare?
Yes. CMS data shows Dr. Darnton billed Medicare for 110 services in 2024, and Dr. Darnton accepts Medicare assignment.
What is Dr. James Byron Darnton's MIPS score?
Dr. Darnton's MIPS final score for performance year 2024 is 94 out of 100, reported through an alternative payment model (APM).
How many Medicare patients does Dr. James Byron Darnton see?
CMS counts 52 Medicare patients who saw Dr. Darnton in 2024, with an average age of 67.
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What services does Dr. James Byron Darnton bill to Medicare?
In 2024, Dr. Darnton's most billed Medicare services were office visit, established patient (99214), medicare service (G2211) and office visit, established patient (99213).
Where did Dr. James Byron Darnton go to medical school?
Dr. Darnton graduated from Perelman School of Med at the University of Pennsylvania in 2013.
What drugs does Dr. James Byron Darnton prescribe most?
In 2024 Medicare Part D data, Dr. Darnton's most prescribed drugs by claims were Atorvastatin Calcium, Amlodipine Besylate and Albuterol Sulfate Hfa.
How long has Dr. James Byron Darnton been practicing?
Dr. Darnton graduated from medical school in 2013, 13 years ago.
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