Quick answers
- Does Andrea R. Clark accept Medicare assignment?
- Yes. Medicare's clinician data says Andrea R. Clark accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Andrea R. Clark see?
- In 2024, CMS data shows 387 Original Medicare patients and 7,642 services for Andrea R. Clark. This counts Original Medicare only and measures volume, not quality.
- What is Andrea R. Clark's NPI number?
- 1013146802. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Andrea R. Clark, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 387 |
|---|---|
| Services billed to Medicare | 7,642 |
| Different services or procedures | 6 |
| Participating Medicare provider | Yes |
| Average age of these patients | 74 |
Most frequent services
- Psychiatric services complicated by communication factor (90785)3,238 services
- Psychotherapy, 30 minutes (90832)2,709 services
- Care management services for behavioral health conditions, 20 minutes or more clinical staff time directed by health care professional (99484)1,119 services
- Psychiatric diagnostic evaluation (90791)548 services
- Psychotherapy, 45 minutes (90834)27 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High blood pressure75%
- High cholesterol75%
- Depression75%
- Diabetes61%
- Anxiety60%
- Arthritis50%
Practice locations
Addresses where Andrea R. Clark is enrolled with Medicare (CMS data updated October 2, 2026).
- 1142 S Diamond Bar Blvd, Suite 383Diamond Bar, CA 91765
- 3024 Willow Pass Rd, Bldg 2Concord, CA 94519
Specialties
- Clinical Psychologistprimary
Other clinical psychologists in Diamond Bar
Clinicians with the same Medicare primary specialty in Diamond Bar, CA — not a recommendation.
Clinician information
| Graduation year | 2013 |
|---|---|
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1013146802 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians