Sarah Fleisig, M.D.
NPI 1275827941 · Hematology & Oncology Physician · Napa, CA
Enrolled with Medicare as Practitioner - Hematology/Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Sarah Fleisig, M.D. is a Hematology & Oncology Physician provider in Napa, CA (NPI 1275827941).
Provider details
- NPI number
- 1275827941
- Entity type
- Individual
- Primary specialty
- Hematology & Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- 56695 (CT)
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
15 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
4 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
115 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) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 65 | $131 |
| Telephone Medical Discussion With Physician, 21-30 Minutes99443 | 18 | $126 |
| Initial Hospital Care With Straightforward Or Low-Level Medical Decision Making, If Using Time, at Least 55 Minutes99222 | 16 | $144 |
| Telephone Medical Discussion With Physician, 11-20 Minutes99442 | 16 | $94 |
Typical Medicare-allowed amounts for these services range $94–$144 (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 |
|---|---|---|
| Ondansetron Hcl | 60 | 17 |
| Dexamethasone | 41 | 12 |
| Amlodipine Besylate | 20 | — |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 20 | — |
| Enzalutamidebrand: Xtandi | 17 | — |
| Prochlorperazine Maleate | 16 | — |
| Osimertinib Mesylatebrand: Tagrisso | 15 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$28 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
Additional practice locations (3)
- 27035 Maiden Moor LnYorba Linda, CA 92887-4226Phone: (714) 290-4050
- 201 N Mountain Rd Ste 202Plainville, CT 06062-1848Phone: (860) 224-4408Fax: (860) 827-3428
- 75 Pringle Way Ste 801Reno, NV 89502-8400Phone: (775) 982-2820Fax: (775) 982-2821
Registry dates
- Enumerated
- 2011-05-31
- Last updated
- 2019-05-22
Frequently asked questions
- What is Sarah Fleisig's NPI number?
- Sarah Fleisig's National Provider Identifier (NPI) is 1275827941, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Sarah Fleisig's specialty?
- Sarah Fleisig is listed in the NPPES registry with a primary specialty of Hematology & Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Sarah Fleisig located?
- Sarah Fleisig's practice location on file with NPPES is 1100 Trancas St Ste 256, Napa, CA 94558.
- What is Sarah Fleisig's phone number?
- The practice phone number listed in the NPPES registry for Sarah Fleisig is (707) 253-7161.
- Does Sarah Fleisig accept Medicare?
- Sarah Fleisig is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Sarah Fleisig's NPI active?
- Yes — Sarah Fleisig's NPI (1275827941) is active in the NPPES registry as of the last update on 2019-05-22.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.