Melissa Williams, M.D.
NPI 1205000122 · Hematology & Oncology Physician · Sacramento, CA
Enrolled with Medicare as Practitioner - Hematology/Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Melissa Williams, M.D. is a Hematology & Oncology Physician provider in Sacramento, CA (NPI 1205000122).
Provider details
- NPI number
- 1205000122
- Entity type
- Individual
- Primary specialty
- Hematology & Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- MD424950 (PA)
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 tenure28% of score
18 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
1,175 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 | 736 | $188 |
| 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 | 214 | $17 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 188 | $134 |
| New Patient Office Or Other Outpatient Visit With a High Level of Medical Decision Making, If Using Time, 60 Minutes Or More99205 | 37 | $229 |
Typical Medicare-allowed amounts for these services range $17–$229 (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 · 19 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Anastrozole | 369 | 109 |
| Letrozole | 129 | 35 |
| Alendronate Sodium | 78 | 24 |
| Prochlorperazine Maleate | 48 | 22 |
| Ondansetron Hcl | 46 | 24 |
| Lorazepam | 44 | 13 |
| Tamoxifen Citrate | 43 | 14 |
| Exemestane | 31 | 13 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2008-04-22
- Last updated
- 2015-07-29
Frequently asked questions
- What is Melissa Williams's NPI number?
- Melissa Williams's National Provider Identifier (NPI) is 1205000122, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Melissa Williams's specialty?
- Melissa Williams is listed in the NPPES registry with a primary specialty of Hematology & Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Melissa Williams located?
- Melissa Williams's practice location on file with NPPES is 2800 L St, Sacramento, CA 95816-5616.
- What is Melissa Williams's phone number?
- The practice phone number listed in the NPPES registry for Melissa Williams is (916) 453-3300.
- Does Melissa Williams accept Medicare?
- Melissa Williams is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Melissa Williams's NPI active?
- Yes — Melissa Williams's NPI (1205000122) is active in the NPPES registry as of the last update on 2015-07-29.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.