Medical emergency?Emergency? Call 911. Nearest emergency roomsNearest ERs

Internal Medicine

Matthew W. Louie, MD

Works at hospitals in Centralia, WA · Olympia, WA · Washington

Summary

Dr. Matthew W. Louie, MD is an internal medicine doctor at 413 Lilly Rd NE, Olympia, WA 98506. Phone: (360) 491-9480. Accepts Medicare assignment. In 2024, Matthew W. Louie had 174 Original Medicare patients and 242 services. NPI 1952689077. 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.

From official Medicare data

This page shows what Medicare's official clinician data says about Matthew W. Louie, 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 Matthew W. Louie accept Medicare assignment?
Yes. Medicare's clinician data says Matthew W. Louie 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 Matthew W. Louie see?
In 2024, CMS data shows 174 Original Medicare patients and 242 services for Matthew W. Louie. This counts Original Medicare only and measures volume, not quality.
What is Matthew W. Louie's NPI number?
1952689077. 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 Matthew W. Louie, 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 patients174
Services billed to Medicare242
Different services or procedures11
Participating Medicare providerYes
Average age of these patients79

Most frequent services

  1. Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)132 services
  2. Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)71 services
  3. Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)12 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 cholesterol72%
  • Heart failure58%
  • Atrial fibrillation55%
  • Chronic kidney disease49%
  • Diabetes44%

Hospitals where Matthew W. Louie works

Medicare's Facility Affiliation Data lists Matthew W. Louie 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 Matthew W. Louie is enrolled with Medicare (CMS data updated October 2, 2026).

Group practices

Medicare enrollment lists Matthew W. Louie as a member of these groups (CMS data updated October 2, 2026).

  • Providence Health and Services Washington14 clinicians in the group
  • Providence Health and Services Washington12 clinicians in the group

Specialties

Find other Internal Medicine doctors in Washington →

Other internal medicine doctors in Olympia

Clinicians with the same Medicare primary specialty in Olympia, WA — not a recommendation.

All internal medicine doctors in Olympia →

Other clinicians in Providence Health and Services Washington

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

Clinician information

CredentialMD
Graduation year2011 (15 years since medical school)
Gender (as listed)Male
Medicare assignmentAccepts (Medicare-approved amount as full payment)
NPI (National Provider Identifier)1952689077
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