Kenneth Mahaffey, MD
NPI 1659455707 · Cardiovascular Disease Physician · Stanford, CA
Enrolled with Medicare as Practitioner - Cardiovascular Disease (cardiology) · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Kenneth Mahaffey, MD is a Cardiovascular Disease Physician provider in Stanford, CA (NPI 1659455707).
Provider details
- NPI number
- 1659455707
- Entity type
- Individual
- Primary specialty
- Cardiovascular Disease PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 96-00991 (NC)
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 tenure25% of score
19 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
947 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) |
|---|---|---|
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Interpretation and Report Only93010 | 767 | $9 |
| Heart Rhythm Review and Interpretation of Continous External Ekg Over 8-15 Days93248 | 67 | $28 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 29 | $209 |
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Interpretation and Report93000 | 20 | $18 |
| Initial Hospital Care With Straightforward Or Low Level of Medical Decision Making, Per Day, If Using Time, at Least 40 Minutes99221 | 19 | $91 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 8 distinct drugs on file.
| Drug | Part D claims (2024) |
|---|---|
| Losartan Potassium | 31 |
| Atorvastatin Calcium | 29 |
| Metoprolol Succinate | 21 |
| Ezetimibe | 18 |
| Rosuvastatin Calcium | 16 |
| Clopidogrel Bisulfatebrand: Clopidogrel | 14 |
| Diltiazem Hclbrand: Diltiazem 24hr Er | 13 |
| Alirocumabbrand: Praluent Pen | 13 |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they include cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means , never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$76,632 across 50 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
- 2006-10-25
- Last updated
- 2024-04-23
- Certified
- 2024-04-23
Frequently asked questions
- What is Kenneth Mahaffey's NPI number?
- Kenneth Mahaffey's National Provider Identifier (NPI) is 1659455707, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Kenneth Mahaffey's specialty?
- Kenneth Mahaffey is listed in the NPPES registry with a primary specialty of Cardiovascular Disease Physician (Allopathic & Osteopathic Physicians).
- Where is Kenneth Mahaffey located?
- Kenneth Mahaffey's practice location on file with NPPES is 300 Pasteur Dr, Stanford, CA 94305-2200.
- What is Kenneth Mahaffey's phone number?
- The practice phone number listed in the NPPES registry for Kenneth Mahaffey is (650) 723-4000.
- Does Kenneth Mahaffey accept Medicare?
- Kenneth Mahaffey is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Kenneth Mahaffey's NPI active?
- Yes — Kenneth Mahaffey's NPI (1659455707) is active in the NPPES registry as of the last update on 2024-04-23.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.