James D. Singleton, MD
Rheumatology Physician · Highlands Ranch, CO
James D. Singleton, MD is a rheumatology physician with a practice address in Highlands Ranch, Colorado, and NPI 1104881226, issued on Apr 20, 2006. Check the license (Colorado 28405, as entered in NPPES) on the Colorado Medical Board; the Medicare figures below come from public CMS files.
- Name
- James D. Singleton
- Credential
- MD
- Primary taxonomy
- Rheumatology Physician 207RR0500X
- License number
- 28405 CO
Self-reported in NPPES; status is on the state search - Practice location
- 206 W County Line Road, Highlands Ranch, CO 80129
- Phone
- (303) 788-8355
- Enumerated
- Apr 20, 2006
- Record last updated
- Apr 21, 2011 (not updated in 15 years: call before relying on the address or phone)
- Fax
- (303) 788-4448
- Medicaid ID
- 01284058 CO
- Medicare enrollment
- Enrolled (PECOS I20110414000448); accepts Medicare assignment
- Medical or professional school
- University Of Kansas School Of Med (Kc/Wich/Sal), 1983
- Entity
- Type 1 · individual
8 nearest rheumatology physician records → All 145 in Colorado → Look up another NPI →
Verify James D. Singleton in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersColorado Medical Board
Search for license 28405Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
50% fewer Medicare Part D claims than the average rheumatology physician in 2024
980 Medicare Part D claims for 151 beneficiaries, against an average of 1,978 among the 6,301 providers of this specialty who prescribed in Part D. Brand-name drugs were 7% of claims.
Most prescribed
- Methotrexate325 claims
- Prednisone106 claims
- Allopurinol87 claims
- Hydroxychloroquine Sulfate55 claims
- Folic Acid40 claims
- Leucovorin Calcium36 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
James D. Singleton among 145 rheumatology physician records in Colorado
James D. Singleton, MD is one of 145 rheumatology physician records with a practice address in Colorado. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 8% of them.
- NPI issued2006 · 8% of these records are older, 59% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 70% of these records are
- Graduated1983 · median 2004 among the 102 with a school on file
- Record last updated2011 · 51% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RR0500X and a Colorado practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Rheumatology Physician providers in Colorado
There are 145 rheumatology physician records in Colorado.
All 145 in Colorado → Every provider in Highlands Ranch → Rheumatology Physician nationwide →
The 8 rheumatology physician records with the nearest ZIP codes
- Heather Berens, M.D., PH.D.Littleton, CO 801271023451218
- Jana Antohe, MDLone Tree, CO 801241629236732
- Rasa Bozaite-Gluosniene, MDLone Tree, CO 801241346441664
- Susan Childress, MDEnglewood, CO 801131235229915
- Jennifer Loucks, M.D.Englewood, CO 801131023040011
- Cherie Reichart, M.D.Englewood, CO 801131457380263
- Robert Spencer, M.D.Englewood, CO 801131497787352
- Eric Westerman, D.O.Englewood, CO 801131538199849
Common questions
What is James D. Singleton, MD's NPI number?
James D. Singleton, MD's National Provider Identifier (NPI) is 1104881226, issued on Apr 20, 2006. An NPI identifies a provider in billing; it is not a license.
Where is James D. Singleton, MD located?
The NPPES record lists a practice address at 206 W County Line Road, Highlands Ranch, CO, 80129. Phone: (303) 788-8355. Providers update this record themselves, so call before visiting.
How can I verify James D. Singleton, MD's license?
NPPES lists Colorado license number 28405, as entered by the provider. Search the Colorado Medical Board at https://dpo.colorado.gov/Medical. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does James D. Singleton, MD prescribe under Medicare Part D?
In 2024, James D. Singleton, MD had 980 Medicare Part D claims for 151 beneficiaries; the average among rheumatology physician prescribers was 1,978. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.