Quick answers
- Does Joshua K. Koh accept Medicare assignment?
- Yes. Medicare's clinician data says Joshua K. Koh 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 Joshua K. Koh see?
- In 2024, CMS data shows 1,278 Original Medicare patients and 4,440 services for Joshua K. Koh. This counts Original Medicare only and measures volume, not quality.
- What is Joshua K. Koh's NPI number?
- 1871609271. 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 Joshua K. Koh, 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 | 1,278 |
|---|---|
| Services billed to Medicare | 4,440 |
| Different services or procedures | 7 |
| Participating Medicare provider | Yes |
| Average age of these patients | 77 |
Most frequent services
- Subsequent nursing facility care with straightforward level of medical decision making, per day, if using time, 20 minutes or more (99308)3,560 services
- Initial nursing facility care with high level of medical decision making, per day, if using time, 50 minutes or more (99306)631 services
- Subsequent nursing facility care with straightforward level of medical decision making, per day, if using time, at least 10 minutes (99307)129 services
- Psychiatric diagnostic evaluation with medical services (90792)52 services
- Residence visit for established patient with straightforward medical decision making, per day, if using time, at least 15 minutes (99347)51 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%
- Depression73%
- Anxiety68%
- Alzheimer's disease or dementia66%
- Arthritis62%
Practice locations
Addresses where Joshua K. Koh is enrolled with Medicare (CMS data updated October 2, 2026).
- 1220 Huntington DrDuarte, CA 91010 (626) 359‑6618
- 2058 N Mills AveClaremont, CA 91711
- 401 W Ada AveGlendora, CA 91741 (626) 335‑9810
- 9488 Citrus AveFontana, CA 92335 (909) 823‑0631
Specialties
- Psychiatryprimary
Other psychiatrists in Duarte
Clinicians with the same Medicare primary specialty in Duarte, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Southwest School Of Medicine And Hospital |
| Graduation year | 1985 (41 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1871609271 |
| 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