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General Surgery

Denis R. Westphal, MD

Works at hospitals in Chico, CA · Oroville, CA · California

Summary

Dr. Denis R. Westphal, MD is a general surgeon at 1026 Mangrove Ave, Suite 10, Chico, CA 95926. Phone: (530) 332-7144. Accepts Medicare assignment. In 2024, Denis R. Westphal had 401 Original Medicare patients and 2,199 services. NPI 1285640243. 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: General surgeon (Medicare lists General Surgery)
  • Address: 1026 Mangrove Ave, Suite 10, Chico, CA 95926 · Directions
  • Phone: (530) 332‑7144
  • Medicare: Accepts Medicare assignment
  • Hospitals: Enloe Health, Oroville Hospital
  • Group practice: Enloe Medical Center
  • Medical school: Loma Linda University School Of Medicine · graduated 1982 (44 years since medical school)
  • Gender (as listed): Male

From official Medicare data

This page shows what Medicare's official clinician data says about Denis R. Westphal, 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 Denis R. Westphal accept Medicare assignment?
Yes. Medicare's clinician data says Denis R. Westphal 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 Denis R. Westphal see?
In 2024, CMS data shows 401 Original Medicare patients and 2,199 services for Denis R. Westphal. This counts Original Medicare only and measures volume, not quality.
What is Denis R. Westphal's NPI number?
1285640243. 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 Denis R. Westphal, 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 patients401
Services billed to Medicare2,199
Different services or procedures19
Participating Medicare providerYes
Average age of these patients74

Most frequent services

  1. Removal of skin and tissue, 20.0 sq cm or less (11042)613 services
  2. Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)507 services
  3. Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more (99212)461 services
  4. Management of oxygen chamber therapy (99183)237 services
  5. Removal of tissue from wound, 20.0 sq cm or less (97597)84 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%
  • Arthritis47%
  • Diabetes45%
  • Chronic kidney disease41%
  • Heart failure36%

Hospitals where Denis R. Westphal works

Medicare's Facility Affiliation Data lists Denis R. Westphal 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.

  • Enloe HealthChico, CA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 050039
  • Oroville HospitalOroville, CA · Acute Care Hospital · Medicare rating: 1 of 5 stars · Emergency services: listed by Medicare · CCN 050030

Practice locations

Addresses where Denis R. Westphal is enrolled with Medicare (CMS data updated October 2, 2026).

Group practices

Medicare enrollment lists Denis R. Westphal as a member of this group (CMS data updated October 2, 2026).

  • Enloe Medical Center333 clinicians in the group

Specialties

Find other General Surgery doctors in California →

Other general surgeons in Chico

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

All general surgeons in Chico →

Other clinicians in Enloe Medical Center

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

Clinician information

CredentialMD
Medical schoolLoma Linda University School Of Medicine
Graduation year1982 (44 years since medical school)
Gender (as listed)Male
Medicare assignmentAccepts (Medicare-approved amount as full payment)
NPI (National Provider Identifier)1285640243
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