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Internal Medicine

Juan Z. Montes, MD

Works at hospitals in Whittier, CA · California

Summary

Dr. Juan Z. Montes, MD is an internal medicine doctor at 11822 Floral Dr, Whittier, CA 90601. Phone: (562) 908-4355. Accepts Medicare assignment. In 2024, Juan Z. Montes had 311 Original Medicare patients and 3,962 services. NPI 1548353055. Source: CMS National Downloadable File, updated October 2, 2026; CMS Facility Affiliation Data, updated October 2, 2026; CMS Medicare Physician & Other Practitioners, data year 2024.

  • Specialty: Internal medicine doctor (Medicare lists Internal Medicine)
  • Address: 11822 Floral Dr, Whittier, CA 90601 · Directions (1 more location)
  • Phone: (562) 908‑4355
  • Medicare: Accepts Medicare assignment
  • Hospital: PIH Health Hospital-Whittier
  • Group practice: Montes Medical Group Inc
  • Medical school: Harvard Medical School · graduated 1976 (50 years since medical school)
  • Gender (as listed): Male
  • Telehealth: offered

From official Medicare data

This page shows what Medicare's official clinician data says about Juan Z. Montes, joined by NPI number (data updated October 2, 2026). It is not a recommendation or a rating. Call the office or hospital to confirm before you go.

In a medical emergency, call 911.

Quick answers

Does Juan Z. Montes accept Medicare assignment?
Yes. Medicare's clinician data says Juan Z. Montes 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 Juan Z. Montes see?
In 2024, CMS data shows 311 Original Medicare patients and 3,962 services for Juan Z. Montes. This counts Original Medicare only and measures volume, not quality.
What is Juan Z. Montes's NPI number?
1548353055. 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 Juan Z. Montes, 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 patients311
Services billed to Medicare3,962
Different services or procedures44
Participating Medicare providerYes
Average age of these patients72

Most frequent services

  1. Management using the results of remote vital sign monitoring per calendar month, each additional 20 minutes (99458)1,488 services
  2. Management using the results of remote vital sign monitoring per calendar month, first 20 minutes (99457)652 services
  3. Remote monitoring of physiologic parameters, initial supply of devices with daily recordings or programmed alerts transmission, each 30 days (99454)278 services
  4. Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)277 services
  5. Insertion of needle into vein for collection of blood sample (36415)256 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 cholesterol74%
  • Diabetes47%
  • Arthritis33%
  • Chronic kidney disease28%
  • Depression18%

Hospitals where Juan Z. Montes works

Medicare's Facility Affiliation Data lists Juan Z. Montes 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.

Practice locations

Addresses where Juan Z. Montes is enrolled with Medicare (CMS data updated October 2, 2026).

Group practices

Medicare enrollment lists Juan Z. Montes as a member of this group (CMS data updated October 2, 2026).

  • Montes Medical Group Inc3 clinicians in the group

Specialties

Find other Internal Medicine doctors in California →

Other internal medicine doctors in Whittier

Clinicians with the same Medicare primary specialty in Whittier, CA — not a recommendation.

All internal medicine doctors in Whittier →

Other clinicians in Montes Medical Group Inc

Medicare enrollment lists these clinicians in the same group practice — not a recommendation.

Clinician information

CredentialMD
Medical schoolHarvard Medical School
Graduation year1976 (50 years since medical school)
Gender (as listed)Male
Medicare assignmentAccepts (Medicare-approved amount as full payment)
TelehealthOffers telehealth services
NPI (National Provider Identifier)1548353055
CorrectionsReport 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

  1. Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
  2. Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
  3. National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
  4. Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
  5. NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
  6. Medicare Care Compare — official Medicare tool to look up clinicians