Bret A. Witter, M.D.
Cardiovascular Disease · Los Alamitos, CA
At a glance
5300 Katella Ave, Los Alamitos, CA 90720-2808
Published activity: Pacemaker insertion or repair. View counts and coverage
NPPES record updated Oct 11, 2018. Public records can lag behind changes at a practice.
Before you call: a quick checklist
- Are you accepting new patients?
- Do you accept my specific insurance plan?
- Do you provide the service I need at this address?
- Do I need a referral, and what is the earliest appointment?
Insurance participation and appointment availability are not established by these public records.
Medicare & insurance
Insurance participation is not established by these public records. Ask the practice and your insurer about your specific plan and this location.
How to check your coverage
Use your plan’s provider directory or the member-services number on your insurance card. Confirm the clinician, practice address, service, and whether a referral is required. A missing opt-out record does not establish Medicare acceptance.
Check the official Medicare directory ↗Practice location
5300 Katella AveLos Alamitos, CA 90720-2808
Education & affiliations
- Medical / professional school
- Baylor College Of Medicine
- Graduation year
- 1987
- CMS specialties
- Cardiovascular Disease (Cardiology)
Practice groups
Reported hospital affiliations
- Memorialcare Long Beach Medical Center Long Beach, CA
- Uci Health-Orange Orange, CA
Graduation year does not establish years in practice. A reported affiliation does not establish employment, current admitting privileges, or insurance participation.
Source: CMS National Downloadable File · Published Oct 15, 2026.
Source: CMS Facility Affiliation Data · Published Oct 15, 2026.
Procedures in the public data
Reported activity can help you ask more informed questions about a practice’s services.
| Procedure category | Published Medicare activity |
|---|---|
| Pacemaker insertion or repair | 1-10 |
CMS uses a one-year claims window with a reporting lag. Counts cover the Medicare activity included by CMS, not all patients. “1–10” is a published range. Volume is not a quality or outcomes score. Coverage and methodology
Source: CMS Utilization Data · Published Oct 15, 2026.
Find providers with a similar service mix
Compare 2024 published Medicare activity in the same reported specialty, here or in another city.
Reported clinician measures
Measures below describe reported clinician performance in the stated period. They do not form an overall HCPList rating, and reporting differs between clinicians.
Published clinical measures
- Coronary Artery Disease (CAD): Antiplatelet Therapy
- 88%2024Published MIPS performance rate. Higher rates indicate better performance for this measure. Measure: MIPS_EC_006_overall. Collection type: REG. Measure denominator: 257.
- Documentation of Current Medications in the Medical Record
- 99%2024Published MIPS performance rate. Higher rates indicate better performance for this measure. Measure: MIPS_EC_130_overall. Collection type: EHR. Measure denominator: 2431.
- Controlling High Blood Pressure
- 81%2024Published MIPS performance rate. Higher rates indicate better performance for this measure. Measure: MIPS_EC_236_overall. Collection type: REG. Measure denominator: 378.
See all 5 reported measures
- Preventive Care and Screening: Screening for High Blood Pressure and Follow-Up Documented
- 31%2024Published MIPS performance rate. Higher rates indicate better performance for this measure. Measure: MIPS_EC_317_overall. Collection type: EHR. Measure denominator: 2431.
- Ischemic Vascular Disease (IVD) All or None Outcome Measure (Optimal Control)
- 75%2024Published MIPS performance rate. Higher rates indicate better performance for this measure. Measure: MIPS_EC_441_overall. Collection type: REG. Measure denominator: 152.
Source: PY 2024 Clinician Public Reporting: MIPS Measures and Attestations · Published Sep 10, 2026.
Industry-reported general payments
Includes reported transfers of value, such as meals, travel, or consulting. Payments do not establish improper conduct or quality of care. Research funding and ownership values are excluded from this total.
See payment purposes and reporting companies
Reported purposes
| Purpose | Amount |
|---|---|
| Food and beverage | $191.22 |
Reporting companies
| Company | Amount |
|---|---|
| AMGEN INC. | $49.70 |
| SCPHARMACEUTICALS INC. | $26.76 |
| PFIZER INC. | $26.70 |
| ABIOMED | $24.71 |
| ALTATHERA PHARMACEUTICALS LLC | $24.24 |
| INSPIRE MEDICAL SYSTEMS, INC. | $20.38 |
| ZOLL SERVICES LLC (A/K/A ZOLL LIFECOR CORP) | $18.73 |
Source: CMS 2025 payments grouped by covered recipient and nature of payments · Published Jun 30, 2026.
Professional details: NPI, taxonomy & registry record
Registry details
- Primary taxonomy
- Cardiovascular Disease
- Taxonomy code
- 207RC0000X
- Enumeration date
- Jun 3, 2006
- Record updated
- Oct 11, 2018
More registry details
- Provider type
- Individual · Type 1
- Reported credentials
- M.D.
Reported taxonomies and licenses
207RC0000X · Primary
License reported: A45250 CA
License numbers and credentials are reported to NPPES; HCPList does not independently verify them.
Practice location
5300 Katella AveLos Alamitos, CA 90720-2808
- Phone
- (562) 430-7533
- Fax
- (562) 430-8055
Mailing address
5300 KATELLA AVELOS ALAMITOS, CA 907202808
Information may be outdated or incomplete. Confirm details directly with the practice. HCPList is an independent directory and is not affiliated with CMS.
Report a directory issue