Quick answers
- Where does James D. Singleton see patients?
- Medicare's clinician data lists 3 practice locations, including Littleton, CO and Englewood, CO. Call before your visit to confirm the address.
- What is James D. Singleton's specialty?
- Medicare lists Rheumatology as the primary specialty, and also Internal Medicine.
- Does James D. Singleton accept Medicare assignment?
- Yes. Medicare's clinician data says James D. Singleton accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for James D. Singleton?
- (303) 788-8355, as listed in official Medicare / NPI Registry data.
- What is James D. Singleton's NPI number?
- 1104881226. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Practice locations
Addresses where James D. Singleton is enrolled with Medicare (CMS data updated 2026-10-02).
- 4 W Dry Creek Cir, Suite 230Littleton, CO 80120 (303) 788‑8355
- 4 W Dry Creek Circle, Suite 230Littleton, CO 80120
- 701 E Hampden Ave, Suite 410Englewood, CO 80113 (303) 788‑1312
Group practices
Medicare enrollment lists James D. Singleton as a member of this group (CMS data updated 2026-10-02).
- Colorado Arthritis Center9 clinicians in the group
Specialties
- Rheumatologyprimary
- Internal Medicinealso
Other rheumatologists in Colorado
Clinicians with the same Medicare primary specialty in Colorado — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Kansas School Of Med (kc/wich/sal) |
| Graduation year | 1983 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1104881226 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians