Bret Witter, M.D.
NPI 1396783387 · Cardiovascular Disease Physician · Los Alamitos, CA
Enrolled with Medicare as Practitioner - Cardiovascular Disease (cardiology) · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Bret Witter, M.D. is a Cardiovascular Disease Physician provider in Los Alamitos, CA (NPI 1396783387).
Provider details
- NPI number
- 1396783387
- Entity type
- Individual
- Primary specialty
- Cardiovascular Disease PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- A45250 (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
4,103 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 | 1,195 | $143 |
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Interpretation and Report Only93010 | 923 | $9 |
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Interpretation and Report93000 | 358 | $16 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 259 | $126 |
| Ultrasound of Heart With Color-Depicted Blood Flow, Rate, Direction and Valve Function93306 | 200 | $217 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 62 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Apixabanbrand: Eliquis | 702 | 172 |
| Metoprolol Succinate | 558 | 190 |
| Amlodipine Besylate | 400 | 133 |
| Atorvastatin Calcium | 389 | 128 |
| Rivaroxabanbrand: Xarelto | 315 | 74 |
| Losartan Potassium | 271 | 96 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$212 across 8 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
- 2006-06-03
- Last updated
- 2018-10-11
Frequently asked questions
- What is Bret Witter's NPI number?
- Bret Witter's National Provider Identifier (NPI) is 1396783387, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Bret Witter's specialty?
- Bret Witter is listed in the NPPES registry with a primary specialty of Cardiovascular Disease Physician (Allopathic & Osteopathic Physicians).
- Where is Bret Witter located?
- Bret Witter's practice location on file with NPPES is 5300 Katella Ave, Los Alamitos, CA 90720-2808.
- What is Bret Witter's phone number?
- The practice phone number listed in the NPPES registry for Bret Witter is (562) 430-7533.
- Does Bret Witter accept Medicare?
- Bret Witter is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Bret Witter's NPI active?
- Yes — Bret Witter's NPI (1396783387) is active in the NPPES registry as of the last update on 2018-10-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.