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

Family Practice

Timothy S. Mulder, MD

Works at hospitals in Willmar, MN · Minnesota

Summary

Dr. Timothy S. Mulder, MD is a family doctor at 101 Willmar Ave SW, Willmar, MN 56201. Phone: (320) 231-5000. Accepts Medicare assignment. In 2024, Timothy S. Mulder had 285 Original Medicare patients and 3,933 services. NPI 1336131747. 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: Family doctor (Medicare lists Family Practice)
  • Address: 101 Willmar Ave SW, Willmar, MN 56201 · Directions (2 more locations)
  • Phone: (320) 231‑5000
  • Medicare: Accepts Medicare assignment
  • Hospital: Centracare- Rice Memorial Hospital
  • Group practice: CentraCare Clinic Southwest LLC
  • Medical school: Sanford School Of Medicine Of University Of South Dakota · graduated 1996 (30 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 Timothy S. Mulder, 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 Timothy S. Mulder accept Medicare assignment?
Yes. Medicare's clinician data says Timothy S. Mulder 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 Timothy S. Mulder see?
In 2024, CMS data shows 285 Original Medicare patients and 3,933 services for Timothy S. Mulder. This counts Original Medicare only and measures volume, not quality.
What is Timothy S. Mulder's NPI number?
1336131747. 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 Timothy S. Mulder, 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 patients285
Services billed to Medicare3,933
Different services or procedures146
Participating Medicare providerYes
Average age of these patients72

Most frequent services

  1. Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)334 services
  2. Insertion of needle into vein for collection of blood sample (36415)237 services
  3. Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)157 services
  4. Blood test, clotting time (85610)139 services
  5. Blood test, basic group of blood chemicals (calcium, total) (80048)87 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 pressure72%
  • High cholesterol70%
  • Arthritis32%
  • Diabetes27%
  • Depression24%
  • Ischemic heart disease23%

Hospitals where Timothy S. Mulder works

Medicare's Facility Affiliation Data lists Timothy S. Mulder 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 Timothy S. Mulder is enrolled with Medicare (CMS data updated October 2, 2026).

Group practices

Medicare enrollment lists Timothy S. Mulder as a member of this group (CMS data updated October 2, 2026).

  • CentraCare Clinic Southwest LLC170 clinicians in the group

Specialties

Find other Family Practice doctors in Minnesota →

Other family doctors in Willmar

Clinicians with the same Medicare primary specialty in Willmar, MN — not a recommendation.

All family doctors in Willmar →

Other clinicians in CentraCare Clinic Southwest LLC

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

Clinician information

CredentialMD
Medical schoolSanford School Of Medicine Of University Of South Dakota
Graduation year1996 (30 years since medical school)
Gender (as listed)Male
Medicare assignmentAccepts (Medicare-approved amount as full payment)
TelehealthOffers telehealth services
NPI (National Provider Identifier)1336131747
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