Sonia Okuyama Sasaki, MD
NPI 1053520049 · Hematology & Oncology Physician · Denver, CO
Enrolled with Medicare as Practitioner - Hematology/Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Sonia Okuyama Sasaki, MD is a Hematology & Oncology Physician provider in Denver, CO (NPI 1053520049).
Provider details
- NPI number
- 1053520049
- Entity type
- Individual
- Primary specialty
- Hematology & Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- 49898 (CO)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
19 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
150 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
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 .
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 | 47 | $145 |
| Telephone Medical Discussion With Physician, 21-30 Minutes99443 | 41 | $126 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 34 | $98 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 28 | $66 |
Typical Medicare-allowed amounts for these services range $66–$145 (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 · 9 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Lenalidomidebrand: Revlimid | 24 | — |
| Anastrozole | 19 | — |
| Ondansetron Hcl | 19 | 13 |
| Prochlorperazine Maleate | 19 | 12 |
| Hydroxyurea | 15 | — |
| Olaparibbrand: Lynparza | 15 | — |
| Ibrutinibbrand: Imbruvica | 14 | — |
| Osimertinib Mesylate |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$119 across 1 record (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-05-22
- Last updated
- 2021-03-06
- Certified
- 2021-03-06
Frequently asked questions
- What is Sonia Okuyama Sasaki's NPI number?
- Sonia Okuyama Sasaki's National Provider Identifier (NPI) is 1053520049, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Sonia Okuyama Sasaki's specialty?
- Sonia Okuyama Sasaki is listed in the NPPES registry with a primary specialty of Hematology & Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Sonia Okuyama Sasaki located?
- Sonia Okuyama Sasaki's practice location on file with NPPES is 700 Delaware St, Denver, CO 80204-4532.
- What is Sonia Okuyama Sasaki's phone number?
- The practice phone number listed in the NPPES registry for Sonia Okuyama Sasaki is (303) 602-6062.
- Does Sonia Okuyama Sasaki accept Medicare?
- Sonia Okuyama Sasaki is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Sonia Okuyama Sasaki's NPI active?
- Yes — Sonia Okuyama Sasaki's NPI (1053520049) is active in the NPPES registry as of the last update on 2021-03-06.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.