Catherine Marmillo, MD, MS
NPI 1518351147 · Family Medicine Physician · Steamboat Springs, CO
Enrolled with Medicare as Practitioner - Hospitalist · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Catherine Marmillo, MD, MS is a Family Medicine Physician provider in Steamboat Springs, CO (NPI 1518351147).
Provider details
- NPI number
- 1518351147
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD, MS
- Sex
- Female
- Sole proprietor
- No
- License
- DR.0067273 (CO)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
11 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
653 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 222 | $94 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 133 | $72 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 55 | $135 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 48 | $49 |
| Automated Urinalysis Test81003 | 36 | $2 |
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Interpretation and Report |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 73 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Levothyroxine Sodium | 206 | 51 |
| Atorvastatin Calcium | 121 | 40 |
| Lisinopril | 98 | 36 |
| Rosuvastatin Calcium | 91 | 37 |
| Gabapentin | 79 | 28 |
| Losartan Potassium | 75 | 20 |
| Amlodipine Besylate |
Practice location
Mailing address
Registry dates
- Enumerated
- 2015-03-20
- Last updated
- 2023-09-24
- Certified
- 2023-09-24
Frequently asked questions
- What is Catherine Marmillo's NPI number?
- Catherine Marmillo's National Provider Identifier (NPI) is 1518351147, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Catherine Marmillo's specialty?
- Catherine Marmillo is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Catherine Marmillo located?
- Catherine Marmillo's practice location on file with NPPES is 940 Central Park Dr Ste 100, Steamboat Springs, CO 80487-8853.
- What is Catherine Marmillo's phone number?
- The practice phone number listed in the NPPES registry for Catherine Marmillo is (970) 879-3327.
- Does Catherine Marmillo accept Medicare?
- Catherine Marmillo is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Catherine Marmillo's NPI active?
- Yes — Catherine Marmillo's NPI (1518351147) is active in the NPPES registry as of the last update on 2023-09-24.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.