Quick answers
- Does Chinnavuth De Monteiro accept Medicare assignment?
- Yes. Medicare's clinician data says Chinnavuth De Monteiro 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 Chinnavuth De Monteiro see?
- In 2024, CMS data shows 946 Original Medicare patients and 6,437 services for Chinnavuth De Monteiro. This counts Original Medicare only and measures volume, not quality.
- What is Chinnavuth De Monteiro's NPI number?
- 1558392449. 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 Chinnavuth De Monteiro, 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 | 946 |
|---|---|
| Services billed to Medicare | 6,437 |
| Different services or procedures | 61 |
| Participating Medicare provider | Yes |
| Average age of these patients | 77 |
Most frequent services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)1,514 services
- Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit (G0439)684 services
- Annual, face-to-face intensive behavioral therapy for cardiovascular disease, individual, 15 minutes (G0446)518 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)512 services
- Face-to-face behavioral counseling for obesity, 15 minutes (G0447)425 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 cholesterol75%
- High blood pressure73%
- Chronic kidney disease35%
- Arthritis34%
- Depression27%
- Diabetes26%
Hospitals where Chinnavuth De Monteiro works
Medicare's Facility Affiliation Data lists Chinnavuth De Monteiro at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- John Muir Medical Center - Concord CampusConcord, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050496
- John Muir Medical Center - Walnut Creek CampusWalnut Creek, CA · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 050180
Practice locations
Addresses where Chinnavuth De Monteiro is enrolled with Medicare (CMS data updated October 2, 2026).
- 2415 High School Ave, Suite 800Concord, CA 94520 (925) 687‑5210
Specialties
- Internal Medicineprimary
Other internal medicine doctors in Concord
Clinicians with the same Medicare primary specialty in Concord, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Js Weill Medical College, Cornell University |
| Graduation year | 1990 (36 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1558392449 |
| 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
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- 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