Kristen Willison, MD
NPI 1306831599 · Family Medicine Physician · San Mateo, CA
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Kristen Willison, MD is a Family Medicine Physician provider in San Mateo, CA (NPI 1306831599).
Provider details
- NPI number
- 1306831599
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- License
- G072317 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
20 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
968 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 358 | $142 |
| 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 | 309 | $19 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 120 | $156 |
| Advance Care Planning, First 30 Minutes99497 | 105 | $94 |
| Administration of Influenza Virus VaccineG0008 | 31 | $39 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 75 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Levothyroxine Sodium | 317 | 82 |
| Atorvastatin Calcium | 289 | 94 |
| Amlodipine Besylate | 237 | 75 |
| Losartan Potassium | 183 | 46 |
| Lisinopril | 136 | 45 |
| Metoprolol Succinate | 128 | 38 |
| Simvastatin |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$600 across 27 records (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
Registry dates
- Enumerated
- 2005-09-14
- Last updated
- 2007-07-08
Frequently asked questions
- What is Kristen Willison's NPI number?
- Kristen Willison's National Provider Identifier (NPI) is 1306831599, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Kristen Willison's specialty?
- Kristen Willison is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Kristen Willison located?
- Kristen Willison's practice location on file with NPPES is 50 S San Mateo Dr, San Mateo, CA 94401-3857.
- What is Kristen Willison's phone number?
- The practice phone number listed in the NPPES registry for Kristen Willison is (650) 348-0454.
- Does Kristen Willison accept Medicare?
- Kristen Willison is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Kristen Willison's NPI active?
- Yes — Kristen Willison's NPI (1306831599) is active in the NPPES registry as of the last update on 2007-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.