Quick answers
- Does James Z. Mu accept Medicare assignment?
- Yes. Medicare's clinician data says James Z. Mu 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 James Z. Mu see?
- In 2024, CMS data shows 270 Original Medicare patients and 464 services for James Z. Mu. This counts Original Medicare only and measures volume, not quality.
- What is James Z. Mu's NPI number?
- 1841231438. 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 James Z. Mu, 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 | 270 |
|---|---|
| Services billed to Medicare | 464 |
| Different services or procedures | 25 |
| Participating Medicare provider | Yes |
| Average age of these patients | 72 |
Most frequent services
- Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)85 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)75 services
- Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)43 services
- Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more (99215)35 services
- New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)33 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 cholesterol74%
- High blood pressure69%
- Arthritis46%
- Depression25%
- Diabetes24%
- Ischemic heart disease24%
Hospitals where James Z. Mu works
Medicare's Facility Affiliation Data lists James Z. Mu 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.
- Providence Regional Medical Center EverettEverett, WA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 500014
Practice locations
Addresses where James Z. Mu is enrolled with Medicare (CMS data updated October 2, 2026).
- 1321 Colby AveEverett, WA 98201
- 14701 179th Ave SEMonroe, WA 98272
- 1700 13th StEverett, WA 98201
- 4225 Hoyt AveEverett, WA 98203
Group practices
Medicare enrollment lists James Z. Mu as a member of this group (CMS data updated October 2, 2026).
- Western Washington Medical Group Inc PS112 clinicians in the group
Specialties
- Gastroenterologyprimary
- Internal Medicinealso
Other gastroenterologists in Everett
Clinicians with the same Medicare primary specialty in Everett, WA — not a recommendation.
Other clinicians in Western Washington Medical Group Inc PS
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1984 (42 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1841231438 |
| 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