Catherine Callister, M.D.
NPI 1124446661 · Internal Medicine Physician · Aurora, CO
Enrolled with Medicare as Practitioner - Hospitalist · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Catherine Callister, M.D. is a Internal Medicine Physician provider in Aurora, CO (NPI 1124446661).
Provider details
- NPI number
- 1124446661
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
12 yrs in NPPES registry
- Profile completeness28% of score
83% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
193 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 122 | $117 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 20 | $170 |
| Hospital Discharge Day Management, More Than 30 Minutes99239 | 20 | $114 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 17 | $78 |
| Hospital Discharge Day Management, 30 Minutes Or Less99238 | 14 | $80 |
Typical Medicare-allowed amounts for these services range $78–$170 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
Practice location
Mailing address
Additional practice locations (1)
- 4940 Eastern AveBaltimore, MD 21224-2735Phone: (410) 550-0535
Registry dates
- Enumerated
- 2014-04-02
- Last updated
- 2018-05-26
Frequently asked questions
- What is Catherine Callister's NPI number?
- Catherine Callister's National Provider Identifier (NPI) is 1124446661, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Catherine Callister's specialty?
- Catherine Callister is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Catherine Callister located?
- Catherine Callister's practice location on file with NPPES is 12605 E 16th Ave, Aurora, CO 80045.
- What is Catherine Callister's phone number?
- The practice phone number listed in the NPPES registry for Catherine Callister is (720) 848-0000.
- Does Catherine Callister accept Medicare?
- Catherine Callister is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Catherine Callister's NPI active?
- Yes — Catherine Callister's NPI (1124446661) is active in the NPPES registry as of the last update on 2018-05-26.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.