Jennifer Williams, MD
NPI 1396007100 · Critical Care Medicine (Internal Medicine) Physician · Stanford, CA
Enrolled with Medicare as Practitioner - Pulmonary Disease · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Jennifer Williams, MD is a Critical Care Medicine (Internal Medicine) Physician provider in Stanford, CA (NPI 1396007100).
Provider details
- NPI number
- 1396007100
- Entity type
- Individual
- Primary specialty
- Critical Care Medicine (Internal Medicine) PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- A140987 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
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
14 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
866 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) |
|---|---|---|
| Critical Care, First 30-74 Minutes99291 | 299 | $232 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 201 | $133 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 89 | $110 |
| Test to Examine How Well the Lungs Exchange Gases94729 | 59 | $10 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 57 | $155 |
| Test to Measure Expiratory Airflow and Volume94010 | 49 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 15 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Albuterol Sulfatebrand: Albuterol Sulfate Hfa | 102 | 37 |
| Fluticasone/Umeclidin/Vilanterbrand: Trelegy Ellipta | 93 | 17 |
| Montelukast Sodium | 50 | 14 |
| Tiotropium Bromidebrand: Spiriva Respimat | 49 | 12 |
| Prednisone | 39 | 17 |
| Fluticasone Propionate | 37 | 16 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2012-06-08
- Last updated
- 2024-04-12
- Certified
- 2024-04-12
Frequently asked questions
- What is Jennifer Williams's NPI number?
- Jennifer Williams's National Provider Identifier (NPI) is 1396007100, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Jennifer Williams's specialty?
- Jennifer Williams is listed in the NPPES registry with a primary specialty of Critical Care Medicine (Internal Medicine) Physician (Allopathic & Osteopathic Physicians).
- Where is Jennifer Williams located?
- Jennifer Williams's practice location on file with NPPES is 300 Pasteur Dr, Stanford, CA 94305-2200.
- What is Jennifer Williams's phone number?
- The practice phone number listed in the NPPES registry for Jennifer Williams is (650) 723-4000.
- Does Jennifer Williams accept Medicare?
- Jennifer Williams is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Jennifer Williams's NPI active?
- Yes — Jennifer Williams's NPI (1396007100) is active in the NPPES registry as of the last update on 2024-04-12.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.