David Karpf, M.D.
NPI 1306913744 · Endocrinology, Diabetes & Metabolism Physician · Santa Cruz, CA
Enrolled with Medicare as Practitioner - Endocrinology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
David Karpf, M.D. is a Endocrinology, Diabetes & Metabolism Physician provider in Santa Cruz, CA (NPI 1306913744).
Provider details
- NPI number
- 1306913744
- Entity type
- Individual
- Primary specialty
- Endocrinology, Diabetes & Metabolism PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- G45513 (CA)
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 tenure33% of score
19 yrs in NPPES registry
- Profile completeness33% of score
100% of core fields populated
- Practice footprint20% of score
3 documented practice locations
- Open Payments transparency13% of score
Has Open Payments disclosures (2024)
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 prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 1 distinct drug on file.
| Drug | Part D claims (2024) |
|---|---|
| Alendronate Sodium | 18 |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude 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 no Part D record, 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.
$219 across 3 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
Additional practice locations (2)
- 16215 Rose AveMonte Sereno, CA 95030-4222Phone: (510) 293-8815Fax: (510) 293-6853
- 300 Pasteur DrA100Stanford, CA 94305-2200Phone: (650) 723-6961
Registry dates
- Enumerated
- 2006-11-29
- Last updated
- 2024-04-25
- Certified
- 2024-04-25
Frequently asked questions
- What is David Karpf's NPI number?
- David Karpf's National Provider Identifier (NPI) is 1306913744, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is David Karpf's specialty?
- David Karpf is listed in the NPPES registry with a primary specialty of Endocrinology, Diabetes & Metabolism Physician (Allopathic & Osteopathic Physicians).
- Where is David Karpf located?
- David Karpf's practice location on file with NPPES is 120 Harmony Ct, Santa Cruz, CA 95062-3473.
- What is David Karpf's phone number?
- The practice phone number listed in the NPPES registry for David Karpf is (650) 721-1300.
- Does David Karpf accept Medicare?
- David Karpf is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is David Karpf's NPI active?
- Yes — David Karpf's NPI (1306913744) is active in the NPPES registry as of the last update on 2024-04-25.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.