NPI registry status
Active
2026 NPPES data Specialist NPI 1720006398 M.D.
Verify on CMS → Alisa Williams Md, M.D.
Specialist in San Diego, California.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 69,608 in Specialist, and covers specialty classification, practice address, and Medicare Part D prescribing data when reported. According to CMS, every field reflects the provider's official federal registration, see our methodology.
Federal data, no proprietary rating.
We show these CMS records as-is - no composite score, no star rating, no editorial opinion layered on top.
Prescribing volume
378
Medicare Part D claims · 122 beneficiaries · Specialist avg: 1K
Generic prescribing
81%
generic claims · 19% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$402.22
7 payments · CMS Open Payments (Sunshine Act)
Source: CMS Medicare Part D Prescriber Public Use File, 2023
What the federal data shows
Alisa Williams Md, M.D. filed 378 Medicare Part D claims in 2023 as a Specialist in San Diego, California, prescribing 81% generic.
- 378
- Part D claims, 2023
- 81%
- generic prescribing
- $402.22
- industry payments (Sunshine Act)
- ≥57th
- pct by Part D claim volume (lower-bound band)
Every figure on this page comes straight from federal CMS records (NPPES, Medicare Part D, MIPS, Open Payments) - no proprietary rating or editorial opinion is applied.
CMS NPPES provider registry desk
NPI 1720006398 · Specialist
NPI-10 · ENUM-LEGACY · TAX-MEGA · RX-LIGHT · BOOK-MID · PHOTO-ENUM
- NPI-10 1720006398
- ENUM-LEGACY 2006
- TAX-MEGA 70K Specialist
- RX-LIGHT 378
- BOOK-MID 6,672 in California
- PHOTO-ENUM Kimberly Lovett · 2006
Alisa Williams Md, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
378 ≥ 57th percentile 57% of 1,370,886 prescribers are in lower value bands
Each bar is a band; taller bars hold more prescribers. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
The percentile is a conservative 100-claim band: it counts only prescribers in lower claim-volume bands. Medicare Part D claim volume is activity context, not a quality measure or recommendation. See methodology § corpus placement.
Source CMS Medicare Part D Prescriber Public Use File · 2023
What does the federal data show about Alisa Williams Md, M.D.?
Quality data not reportedPrimary specialty
Specialist
Medicare Part D claims
378 74% vs specialty avg
Specialty distribution in California
How Specialist compares to other specialties among California providers
Board certification
Not published by CMS
CMS does not publish a per-provider board-certification field in NPPES. PlainDoctor does not have a reliable per-specialty certification rate to show for Specialist. Verify directly:
How MIPS and board certification work
The Merit-based Incentive Payment System (MIPS) scores providers 0–100 across four performance categories: Quality, Cost, Promoting Interoperability, and Improvement Activities, weighted under 42 CFR §414.1380. Reporting is voluntary for many small practices, so absence of a MIPS score is not a quality signal.
Board certification through an ABMS or AOA member board signals voluntary post-licensure examination plus continuous Maintenance of Certification cycles. Verify any individual provider's status through certificationmatters.org (ABMS) or osteopathic.org (AOA).
Practice Address
Provider Details
| NPI | 1720006398 |
|---|---|
| Specialty | Specialist |
| Credentials | M.D. |
| Gender | Female |
| NPI Issued | 07/18/2006 |
Industry payments received (2024) - CMS Open Payments transparency data
The federal Physician Payments Sunshine Act (part of the Affordable Care Act) requires drug and medical-device manufacturers + group purchasing organizations to publicly report payments and other transfers of value to physicians and teaching hospitals. The data below covers 2024 for Alisa Williams Md, M.D.. Source: openpaymentsdata.cms.gov.
Total received
$402
Largest payer
Hologic Sales and Service, LLC
Most common payment type
Food and Beverage
Industry payments are not necessarily indicators of bias, they include research funding, consulting fees for evidence-based work, royalties for inventions, food at conferences, and similar items. The disclosure exists for transparency. Read our methodology for how we interpret this data.
License & disciplinary context - California MBC 2023 annual report
Aggregate state board data only, NOT a determination of any individual provider's status. The figures below describe statewide disciplinary activity across all ~150K California medical licensees in 2023 - they are NOT specific to Alisa Williams Md, M.D.. To verify Alisa Williams Md, M.D.'s current license status, search the MBC public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.
576
Total board actions, California 2023
Across 556 cases
3.84
Actions per 1,000 licensees
California statewide rate
probation
Most common action type
186 cases
MBC publishes annual disciplinary statistics as part of public-record reporting under each state's Administrative Procedure Act. See the full breakdown by action type and year on the California disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.
Brand vs generic prescribing mix · Typical
Alisa Williams Md, M.D. - brand share 19.0%
Specialist average
19% brand-name claims vs 81% generic, on 378 2023 Medicare Part D claims.
The federal Medicare Part D Generic Dispensing Rate national benchmark sits near 90% generic / 10% brand for primary-care prescribers, per CMS Office of the Actuary 2024 estimates. Higher brand share is common in specialty prescribing where generic equivalents are not available.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
378
Total Claims
$49K
Total Drug Cost
122
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 807
- Total Day Supply
- 23,020
- Brand vs Generic
- 19% brand / 81% generic
- Brand Drug Cost
- $31K
- Generic Drug Cost
- $18K
- Antibiotic Claims
- 19
Patient Demographics
- Average Patient Age
- 71.4 years
- Avg HCC Risk Score
- 0.91
- Gender Split
- 100% female / 0% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Alisa Williams Md, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Estradiol
Estradiol
84 claims
- Ibandronate Sodium 22
Ibandronate Sodium
22 claims
- Estradiol (Twice W… 18
Estradiol (Twice Weekly)
18 claims
- Estring 18
Estring
18 claims
- Acyclovir 17
Acyclovir
17 claims
- Fluconazole 17
Fluconazole
17 claims
- Terconazole 17
Terconazole
17 claims
- Clobetasol Propion… 16
Clobetasol Propionate
16 claims
| Drug | Claims |
|---|---|
| Estradiol | 84 |
| Ibandronate Sodium | 22 |
| Estradiol (Twice Weekly) Estradiol | 18 |
| Estring Estradiol | 18 |
| Acyclovir | 17 |
| Fluconazole | 17 |
| Terconazole | 17 |
| Clobetasol Propionate | 16 |
| Myrbetriq Mirabegron | 14 |
| Clotrimazole-Betamethasone Clotrimazole/Betamethasone Dip | 12 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Specialist Overview
How Alisa Williams Md, M.D. fits within the Specialist landscape nationally.
69,608
Specialist Providers in US
55
States with Specialist
1,474
Avg Claims per Provider
Alisa Williams Md, M.D.'s 378 claims are below the specialty average of 1,474.
Nationwide Specialist peers with similar MIPS or enrollment year
Two federal-record peer sets for Williams Md, both outside California so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2006)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Specialist Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Williams Md.
One of 6,672 Specialist providers enrolled in California, 5 are shown here.
Adrienne Abad Santos
San Francisco, CA
Dr. Brenda Abarca
MD
Torrance, CA
Dr. Fatemeh Abbasi
PT
Van Nuys, CA
Dr. Erlinda Abcede
M.D.
Cudahy, CA
Dr. Maher Abdallah
M.D.
Palm Springs, CA
Compare Specialist nationally: see state-by-state distribution →
Frequently Asked Questions
What is Alisa Williams Md, M.D.'s specialty? ▼
Alisa Williams Md, M.D. specializes in Specialist and practices in San Diego, California. Credentials: M.D..
How much does Alisa Williams Md, M.D. prescribe under Medicare Part D? ▼
In 2023, Alisa Williams Md, M.D. wrote 378 Medicare Part D claims totaling $49K in drug costs for 122 beneficiaries.
Where is Alisa Williams Md, M.D. located? ▼
Alisa Williams Md, M.D. is located at 5555 RESERVOIR DR STE 307, San Diego, CA, 92120. Phone: (619) 299-3111.
What is Alisa Williams Md, M.D.'s NPI number? ▼
Alisa Williams Md, M.D.'s National Provider Identifier (NPI) is 1720006398, issued on 07/18/2006.
Does Alisa Williams Md, M.D. prescribe more brand-name or generic drugs? ▼
Alisa Williams Md, M.D.'s prescribing is 19% brand-name and 81% generic drugs by claim count, with $31K in brand drug costs.
How many Specialist providers are there in the US? ▼
There are 69,608 Specialist providers across 55 states in the US. The average Specialist provider writes 1,474 Medicare Part D claims per year.
What drugs does Alisa Williams Md, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Alisa Williams Md, M.D.'s most frequently prescribed drugs include Estradiol, Ibandronate Sodium, Estradiol (Twice Weekly). This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Alisa Williams Md, M.D. accept Medicare? ▼
Alisa Williams Md, M.D. appears in CMS Medicare data with 378 Part D claims and 122 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Alisa Williams Md, M.D.'s credentials? ▼
Alisa Williams Md, M.D.'s NPI is 1720006398 with credentials M.D.. You can verify this through the NPPES NPI Registry, check state medical board records, and confirm board certification through the ABMS or AOA.
Data Sources
View source datasets and methodology notes
- Provider Directory
- CMS National Plan and Provider Enumeration System (NPPES), download.cms.gov/nppes, updated monthly. Contains NPI, specialty, credentials, and practice location.
- Specialty Classification
- NUCC Health Care Provider Taxonomy (nucc.org), the industry standard for classifying provider specialties in Medicare and Medicaid billing.
- Prescribing Data
- CMS Medicare Part D Prescriber Public Use File (2023). Includes claims, drug costs, beneficiaries, and opioid prescribing rates.
- Limitations
- Provider data is self-reported to CMS. Prescribing data reflects Medicare Part D only and does not include commercial insurance, Medicaid, or cash prescriptions. Claims below 11 beneficiaries are suppressed by CMS for privacy.
See our complete data methodology for details on how we collect and process government data.
Data as of April 2026 (NPPES) / 2023 (Medicare Part D). Source: Centers for Medicare & Medicaid Services (CMS).
Disclaimer: Data from CMS NPPES and Medicare Part D. PlainDoctor does not rate or rank providers. Provider information is self-reported and may not be current. Always verify information directly with the provider. About · Methodology
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of May 2026.