Mark Sitarik, MD
NPI 1346224664 · Hematology & Oncology Physician · Boulder, CO
Enrolled with Medicare as Practitioner - Hematology/Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Sitarik, MD is a Hematology & Oncology Physician provider in Boulder, CO (NPI 1346224664).
Provider details
- NPI number
- 1346224664
- Entity type
- Individual
- Primary specialty
- Hematology & Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 26965 (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
20 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
2,551 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 Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 619 | $91 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 259 | $128 |
| Administration of Chemotherapy Into Vein, 1 Hour Or Less96413 | 198 | $132 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 197 | $16 |
| Enhancing Oncology Model (eom) Monthly Enhanced Oncology Services (meos) Payment for Eom Enhanced ServicesM0010 | 179 | $72 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 37 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Anastrozole | 100 | 31 |
| Apixabanbrand: Eliquis | 64 | 15 |
| Lorazepam | 60 | 18 |
| Hydroxyurea | 53 | 12 |
| Acyclovir | 52 | — |
| Prednisone | 46 | 13 |
| Dexamethasone | 41 | 11 |
| Gabapentin |
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-11-30
- Last updated
- 2011-07-15
Frequently asked questions
- What is Mark Sitarik's NPI number?
- Mark Sitarik's National Provider Identifier (NPI) is 1346224664, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Sitarik's specialty?
- Mark Sitarik is listed in the NPPES registry with a primary specialty of Hematology & Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Sitarik located?
- Mark Sitarik's practice location on file with NPPES is 4715 Arapahoe Ave, Boulder, CO 80303-1385.
- What is Mark Sitarik's phone number?
- The practice phone number listed in the NPPES registry for Mark Sitarik is (303) 385-2000.
- Does Mark Sitarik accept Medicare?
- Mark Sitarik is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Sitarik's NPI active?
- Yes — Mark Sitarik's NPI (1346224664) is active in the NPPES registry as of the last update on 2011-07-15.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.