Stuart Kassan, MD
NPI 1093706475 · Rheumatology Physician · Denver, CO
Enrolled with Medicare as Practitioner - Rheumatology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Stuart Kassan, MD is a Rheumatology Physician provider in Denver, CO (NPI 1093706475).
Provider details
- NPI number
- 1093706475
- Entity type
- Individual
- Primary specialty
- Rheumatology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 21547 (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
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
427 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 High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 327 | $141 |
| New Patient Office Or Other Outpatient Visit With a High Level of Medical Decision Making, If Using Time, 60 Minutes Or More99205 | 40 | $178 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 31 | $95 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 29 | $181 |
Typical Medicare-allowed amounts for these services range $95–$181 (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.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 29 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Hydroxychloroquine Sulfate | 317 | 110 |
| Prednisone | 186 | 63 |
| Methotrexate Sodiumbrand: Methotrexate | 76 | 28 |
| Pilocarpine Hcl | 56 | 25 |
| Gabapentin | 43 | 12 |
| Cevimeline Hcl | 42 | 19 |
| Ergocalciferol (vitamin D2)brand: Vitamin D2 | 40 |
Practice location
Mailing address
Additional practice locations (1)
- 198 Union BlvdSuite 150Lakewood, CO 80228-2259Phone: (303) 892-6033Fax: (303) 573-6929
Registry dates
- Enumerated
- 2005-11-03
- Last updated
- 2023-01-04
- Certified
- 2023-01-04
Frequently asked questions
- What is Stuart Kassan's NPI number?
- Stuart Kassan's National Provider Identifier (NPI) is 1093706475, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Stuart Kassan's specialty?
- Stuart Kassan is listed in the NPPES registry with a primary specialty of Rheumatology Physician (Allopathic & Osteopathic Physicians).
- Where is Stuart Kassan located?
- Stuart Kassan's practice location on file with NPPES is 1400 Jackson St, Denver, CO 80206-2762.
- What is Stuart Kassan's phone number?
- The practice phone number listed in the NPPES registry for Stuart Kassan is (303) 388-4461.
- Does Stuart Kassan accept Medicare?
- Stuart Kassan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Stuart Kassan's NPI active?
- Yes — Stuart Kassan's NPI (1093706475) is active in the NPPES registry as of the last update on 2023-01-04.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.