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DR. DAVID ANDREW MARK M.D.
NPI 1023166840
Internal Medicine in Hardin, MT

Active since January 08, 2007PECOS Enrolled
402 N CENTER AVE, HARDIN, MT 59034(406) 655-4103 Get Directions Write a Review

NPPES record last updated: July 27, 2026. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Jul 27, 2026, Mar 18, 2026 (2 updates tracked since 2026).

About Dr. David Andrew Mark M.d. NPPES

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

DR. DAVID ANDREW MARK M.D. (NPI 1023166840) is an individual internal medicine provider in Hardin, Montana, licensed in Montana (MED-PHYS-LIC-12540) and active in the NPI registry since January 2007. He is enrolled in Medicare PECOS and maintains a secondary practice location in Hardin.

NPPES Registry Identity

NPI1023166840
Entity TypeIndividualMale
Primary Taxonomy207R00000X
Provider Legal NameDR. DAVID ANDREW MARKCredential: M.D.
Location Address402 N CENTER AVEHardin, MT 59034-1808
Mailing Address402 N Center AveHardin, MT 59034-1808 · (406) 655-4103
Phone(406) 655-4103
Sole ProprietorNo
Enumeration DateJanuary 8, 2007
Last NPPES UpdateJuly 27, 20262 updates tracked since enumeration
NPPES CertifiedJuly 27, 2026
✔ NPI 1023166840 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 3

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License✔ Licensed in MT · MED-PHYS-LIC-12540
Definition
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
Also ListedFamily MedicineTaxonomy 207Q00000X · License MED-PHYS-LIC-12540 (MT)
Also ListedPediatricsTaxonomy 208000000X · License MED-PHYS-LIC-12540 (MT)
402 N CENTER AVE, Hardin, MT 59034
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Secondary Practice Location 1

Location 110 WEST 4TH STREETHARDIN, MT 59034-1804 · Phone (406) 623-9330

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 and more.Insurance ›

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. David Andrew Mark M.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

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

3

Medicare enrollment records show David Mark reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Big Horn Hospital Association
0.6 mi
Critical Access
17 NORTH MILES AVENUE
Hardin, MT 59034
  • Reassigned Medicare billing, Montana enrollment
  • 53 clinicians in this Medicare group
NPI 1891713533 (406) 665-2310
Bighorn Valley Health Center, Incorporated
0.6 mi
Federally Qualified Health Center (FQHC)
721 N MILES AVE
Hardin, MT 59034
  • Reassigned Medicare billing, Montana enrollment
  • 82 clinicians in this Medicare group
NPI 1821751470 (406) 665-4103
Us Health Dept Of Health & Human Services
11 mi
Critical Access
10110 SOUTH 7650 EAST
Crow Agency, MT 59022
  • Reassigned Medicare billing, Texas enrollment
  • Medicare enrollment name: U S Health Dept Of Health & Human Services
  • 306 clinicians in this Medicare group
NPI 1548393358 (406) 638-3500

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

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 59034 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
$130.52 typical visit price
range $56.81 – $172.26
Typical copayment $32.63 (range $14.20 – $43.06)
Most-billed visit code 99204
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 2

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

Portable gaseous oxygen system, rental; includes portable container, regulator, flowmeter, humidifier, cannula or mask, and tubing E0431
DME-Oxygen and Supplies · category DC000N
1 supplier48 claims48 services$17.74 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
1 supplier41 claims41 services$104.49 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 2

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

BIGHORN VALLEY HEALTH CENTER INCORPORATED
Pharmacy (Community/Retail Pharmacy)
402 N CENTER AVE
HARDIN, MT 59034
Big Horn County (406) 867-4141
BIGHORN VALLEY HEALTH CENTER INCORPORATED
Durable Medical Equipment & Medical Supplies
402 N CENTER AVE
HARDIN, MT 59034
Big Horn County (406) 867-4141

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 David Mark's NPI number?

The NPI number for David Mark is 1023166840. It was assigned to this individual provider in the NPPES registry on January 8, 2007.

Where is David Mark located?

David Mark practices at 402 N Center Ave, Hardin, MT 59034. The listed phone number is (406) 655-4103.

What is David Mark's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Is David Mark enrolled in Medicare?

Yes. David Mark is registered in the Medicare PECOS enrollment system.

Which organizations bill Medicare for David Mark's services?

According to the CMS Revalidation Reassignment List (October 2026 release), David Mark reassigns Medicare benefits to 3 organizations: Big Horn Hospital Association (Hardin, MT), Bighorn Valley Health Center, Incorporated (Hardin, MT) and Us Health Dept Of Health & Human Services (Crow Agency, 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 David Mark's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does David Mark accept?

Health plans from Blue Cross and Blue Shield of Montana, Mountain Health CO-OP, PacificSource Health Plans and Providence Health Plan list David Mark 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.

When was this NPI record last updated?

The NPPES record for David Mark was last updated on July 27, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.