Quick answers
- Which hospitals does Colin E. Diffie work at?
- Medicare's official clinician data lists Colin E. Diffie at 5 hospitals: Barnes Jewish Hospital, Barnes-Jewish West County Hospital, Memorial Hospital, Missouri Baptist Medical Center and Parkland Health Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Colin E. Diffie see patients?
- Medicare's clinician data lists 4 practice locations, including Saint Louis, MO. Call before your visit to confirm the address.
- What is Colin E. Diffie's specialty?
- Medicare lists Rheumatology as the primary specialty, and also Internal Medicine.
- Does Colin E. Diffie accept Medicare assignment?
- Yes. Medicare's clinician data says Colin E. Diffie 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.
- Does Colin E. Diffie offer telehealth?
- Medicare's clinician data says Colin E. Diffie offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Colin E. Diffie?
- (314) 747-3000, as listed in official Medicare / NPI Registry data.
- What is Colin E. Diffie's NPI number?
- 1942616404. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Colin E. Diffie works
Medicare's Facility Affiliation Data lists Colin E. Diffie at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Barnes Jewish HospitalSaint Louis, MO · Acute Care Hospital · CCN 260032
- Barnes-Jewish West County HospitalCreve Coeur, MO · Acute Care Hospital · CCN 260162
- Memorial HospitalBelleville, IL · Acute Care Hospital · CCN 140185
- Missouri Baptist Medical CenterSaint Louis, MO · Acute Care Hospital · CCN 260108
- Parkland Health CenterFarmington, MO · Acute Care Hospital · CCN 260163
Practice locations
Addresses where Colin E. Diffie is enrolled with Medicare (CMS data updated 2026-10-02).
- 1 Barnes Jew Hosp PlzSaint Louis, MO 63110 (314) 747‑3000
- 4921 Parkview PlSaint Louis, MO 63110
- 5201 Mid America PlzSaint Louis, MO 63129
- 5225 Mid America PlzSaint Louis, MO 63129 (800) 647‑2098
Group practices
Medicare enrollment lists Colin E. Diffie as a member of this group (CMS data updated 2026-10-02).
- Washington University3,029 clinicians in the group
Specialties
- Rheumatologyprimary
- Internal Medicinealso
Other rheumatologists in Saint Louis
Clinicians with the same Medicare primary specialty in Saint Louis, MO — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2014 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1942616404 |
| 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
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated 2026-10-02, retrieved 2026-10-29
- 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