NPPES file of Aug 9, 2026

Melissa J. Williams, M.D.

Hematology & Oncology Physician · Sacramento, CA

Melissa J. Williams, M.D. is a hematology & oncology physician with a practice address in Sacramento, California, and NPI 1205000122, issued on Apr 22, 2008. Check the license (California A109254, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · Medicare files 2024 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1205000122
Name
Melissa J. Williams
Credential
M.D.
Primary taxonomy
Hematology & Oncology Physician 207RH0003X
License numbers
A109254 CA
MD424950 PA
Self-reported in NPPES; status is on the state search
Practice location
2800 L St, Sacramento, CA 95816
Phone
(916) 453-3300
Enumerated
Apr 22, 2008
Record last updated
Jul 29, 2015 (not updated in 11 years: call before relying on the address or phone)
Fax
(916) 454-6822
Medicare enrollment
Enrolled (PECOS I20091105000488); accepts Medicare assignment
Medical or professional school
University Of Wisconsin School Of Medicine, 2001
Telehealth
Offers telehealth (CMS)
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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8 nearest hematology & oncology physician records → All 1,583 in California → Look up another NPI →

Also registered at 2800 L St

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Richard Atkinson, MDNeurology Physician1154344992
  2. William Au, M.D.Neurology Physician1457375321
  3. Richard Axelrod, M.D.Cardiovascular Disease Physician1437147923
  4. Sarah Chan, M.D.Diagnostic Radiology Physician1437353125
  5. Samuel Ciricillo, M.D.Neurological Surgery Physician1841305554
  6. Richard Ericson, MDCardiovascular Disease Physician1649314055

Verify Melissa J. Williams in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersMedical Board of California
    Search for license A109254    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Open the California license search

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

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38% more Medicare Part D claims than the average hematology & oncology physician in 2024

1,214 Medicare Part D claims for 239 beneficiaries, against an average of 877 among the 10,784 providers of this specialty who prescribed in Part D. Brand-name drugs were 7% of claims. 36 claims were for opioids.

  1. Melissa Williams1,214
  2. Specialty average877

Most prescribed

  1. Anastrozole369 claims
  2. Letrozole129 claims
  3. Alendronate Sodium78 claims
  4. Prochlorperazine Maleate48 claims
  5. Ondansetron Hcl46 claims
  6. Lorazepam44 claims

Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.

Bills Medicare through one group practice

  1. Sutter Valley Medical FoundationSacramento, CA

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).

Melissa J. Williams among 1,583 hematology & oncology physician records in California

Melissa J. Williams, M.D. is one of 1,583 hematology & oncology physician records with a practice address in California. 83% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2008, is newer than 60% of them.

  • NPI issued2008 · 60% of these records are older, 34% newer
  • In a Medicare fileYes · 83% of these records are
  • In the CMS Doctors and Clinicians fileYes · 71% of these records are
  • Graduated2001 · median 2003 among the 1,124 with a school on file
  • Record last updated2015 · 58% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RH0003X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Hematology & Oncology Physician providers in California

There are 1,583 hematology & oncology physician records in California.

All 1,583 in California → Every provider in Sacramento → Hematology & Oncology Physician nationwide →

The 8 hematology & oncology physician records with the nearest ZIP codes

  1. Michael Carroll, M.D.Sacramento, CA 958161699748707
  2. Grigorios Chrysofakis, MDSacramento, CA 958161700159118
  3. Nabil Ghani, M.D.Sacramento, CA 958161407390172
  4. Brian Kim, M.D.Sacramento, CA 958161871532051
  5. Elias Kiwan, M.D.Sacramento, CA 958161790875276
  6. Jasdeepa Nagi, M.D.Sacramento, CA 958161407094188
  7. Bijay Nair, MDSacramento, CA 958161356560684
  8. Nitin Rohatgi, M.D.Sacramento, CA 958161235161621

Common questions

What is Melissa J. Williams, M.D.'s NPI number?

Melissa J. Williams, M.D.'s National Provider Identifier (NPI) is 1205000122, issued on Apr 22, 2008. An NPI identifies a provider in billing; it is not a license.

Where is Melissa J. Williams, M.D. located?

The NPPES record lists a practice address at 2800 L St, Sacramento, CA, 95816. Phone: (916) 453-3300. Providers update this record themselves, so call before visiting.

How can I verify Melissa J. Williams, M.D.'s license?

NPPES lists California license number A109254, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.

How much does Melissa J. Williams, M.D. prescribe under Medicare Part D?

In 2024, Melissa J. Williams, M.D. had 1,214 Medicare Part D claims for 239 beneficiaries; the average among hematology & oncology physician prescribers was 877. Part D covers Medicare prescriptions only.

Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.