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DR. WALLACE CHESTER WALKER MD
NPI 1740279389
Family Medicine in Big Timber, MT

Active since October 17, 2005PECOS EnrolledAccepts Medicare Assignment
225 BIG TIMBER LOOP RD, BIG TIMBER, MT 59011(406) 932-7100(406) 932-7102 Get Directions Write a Review

NPPES record last updated: December 6, 2024. Verified against the NPPES registry weekly; last sync: November 01, 2026.

About Dr. Wallace Chester Walker Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. WALLACE CHESTER WALKER MD (NPI 1740279389) is an individual family medicine provider in Big Timber, Montana, licensed in Montana (6045) and active in the NPI registry since October 2005. He is enrolled in Medicare PECOS, is affiliated with St Vincent Healthcare, and is a graduate of George Washington University School Of Medicine (1984).

NPPES Registry Identity

NPI1740279389
Entity TypeIndividualMale
Primary Taxonomy207Q00000X
Provider Legal NameDR. WALLACE CHESTER WALKERCredential: MD
Location Address225 BIG TIMBER LOOP RDBig Timber, MT 59011-7646
Mailing AddressPo Box 1267Big Timber, MT 59011-1267 · (406) 932-5419 · Fax (406) 932-5515
Phone(406) 932-7100
Fax(406) 932-7102
Sole ProprietorNo
Medical School CMSGeorge Washington University School Of MedicineGraduated 1984
Enumeration DateOctober 17, 2005
Last NPPES UpdateDecember 6, 2024
NPPES CertifiedDecember 6, 2024
✔ NPI 1740279389 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyFamily MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207Q00000X
License✔ Licensed in MT · 6045
Definition
Family Medicine is the medical specialty which is concerned with the total health care of the individual and the family. It is the specialty in breadth which integrates the biological, clinical, and behavioral sciences. The scope of family medicine is not limited by age, sex, organ system, or disease entity.
225 BIG TIMBER LOOP RD, Big Timber, MT 59011
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Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Blue Cross and Blue Shield of Montana, Mountain Health CO-OP, PacificSource Health Plans.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Wallace Chester Walker Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID2466592738
PECOS Enrollment IDI20091217000041
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

2

Medicare enrollment records show Wallace Walker reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Crazy Mountain Family Medicine
Same address
Primary Care
225 BIG TIMBER LOOP RD
Big Timber, MT 59011
  • Reassigned Medicare billing, Montana enrollment
  • 2 clinicians in this Medicare group
NPI 1497357529 (406) 932-7100
Pioneer Medical Center
0.7 mi
Critical Access
301 W 7TH AVE
Big Timber, MT 59011
  • Reassigned Medicare billing, Montana enrollment
  • 33 clinicians in this Medicare group
NPI 1003939190 (406) 932-4603

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Hospital Affiliations CMS Care Compare 3

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

St Vincent Healthcare

Acute Care Hospitals · Billings, MT
4/5 CMS rating
OwnershipVoluntary non-profit - Church
CMS Certification Number270049
Location1233 N 30th StBillings, MT 59101 · Yellowstone County
Emergency services Birthing friendly

Pioneer Medical Center

Critical Access Hospitals · Big Timber, MT
OwnershipVoluntary non-profit - Private
CMS Certification Number271313
Location301 W 7th AveBig Timber, MT 59011 · Sweet Grass County
Emergency services

Livingston Healthcare

Critical Access Hospitals · Livingston, MT
3/5 CMS rating
OwnershipPhysician
CMS Certification Number271317
Location320 Alpenglow LaneLivingston, MT 59047 · Park County
Emergency services

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 59011 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$87.97 typical visit price
range $56.81 – $172.26
Typical copayment $21.99 (range $14.20 – $43.06)
Most-billed visit code 99203
Established Patient
$100.16 typical visit price
range $18.24 – $140.32
Typical copayment $25.04 (range $4.56 – $35.08)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Referred Medical Equipment & Supplies CMS DME claims 7

Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.

Filter, disposable, used with positive airway pressure device A7038
DME-Other DME · category DE001N
7 suppliers13 claims59 services$3.12 avg. paid by Medicare
Portable gaseous oxygen system, rental; includes portable container, regulator, flowmeter, humidifier, cannula or mask, and tubing E0431
DME-Oxygen and Supplies · category DC000N
2 suppliers57 claims65 services$20.96 avg. paid by Medicare
Continuous positive airway pressure (cpap) device E0601
DME-Other DME · category DE001N
3 suppliers21 claims21 services$39.94 avg. paid by Medicare
Oxygen concentrator, single delivery port, capable of delivering 85 percent or greater oxygen concentration at the prescribed flow rate E1390
DME-Oxygen and Supplies · category DC002N
4 suppliers96 claims102 services$111.70 avg. paid by Medicare
Portable oxygen concentrator, rental E1392
DME-Oxygen and Supplies · category DC002N
1 supplier12 claims12 services$38.23 avg. paid by Medicare
Albuterol, up to 2.5 mg and ipratropium bromide, up to 0.5 mg, fda-approved final product, non-compounded, administered through dme J7620
DME-Drugs Administered Through DME · category DG006N
2 suppliers13 claims1,500 services$0.09 avg. paid by Medicare
Dollar amounts are the average Medicare paid the supplier per service. They are not the cost to the patient.

Other Providers at the Same Location NPPES 3

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

MICHELLE M LIZOTTE MD
Family Medicine
225 BIG TIMBER LOOP RD
BIG TIMBER, MT 59011
Sweet Grass County (406) 932-7100
NATASHA JUNE STENBERG RDN
Dietitian, Registered
225 BIG TIMBER LOOP RD
BIG TIMBER, MT 59011
Sweet Grass County (406) 932-7100
CRAZY MOUNTAIN FAMILY MEDICINE
Clinic/Center (Primary Care)
225 BIG TIMBER LOOP RD
BIG TIMBER, MT 59011
Sweet Grass County (406) 932-7100

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Wallace Walker's NPI number?

The NPI number for Wallace Walker is 1740279389. It was assigned to this individual provider in the NPPES registry on October 17, 2005.

Where is Wallace Walker located?

Wallace Walker practices at 225 Big Timber Loop Rd, Big Timber, MT 59011. The listed phone number is (406) 932-7100.

What is Wallace Walker's specialty?

The primary specialty registered for this NPI is Family Medicine with taxonomy code 207Q00000X.

Is Wallace Walker enrolled in Medicare?

Yes. Wallace Walker is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organizations bill Medicare for Wallace Walker's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Wallace Walker reassigns Medicare benefits to 2 organizations: Crazy Mountain Family Medicine (Big Timber, MT) and Pioneer Medical Center (Big Timber, MT). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Wallace Walker's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Wallace Walker accept?

Health plans from Blue Cross and Blue Shield of Montana, Mountain Health CO-OP and PacificSource Health Plans list Wallace Walker as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

Is Wallace Walker affiliated with any hospitals?

According to CMS data, Wallace Walker is affiliated with St Vincent Healthcare, Pioneer Medical Center and Livingston Healthcare.

When was this NPI record last updated?

The NPPES record for Wallace Walker was last updated on December 6, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 22 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.