DR. DEANNA L. ARMSTRONG M.D.
NPI 1003900184
Psychiatry & Neurology - Psychiatry in Helena, MT

Q: What is Deanna Armstrong's NPI number?

The NPI number for Deanna Armstrong is 1003900184. It was assigned to this individual provider in the NPPES registry on October 3, 2006. The provider is also known as Deanna L. Munisteri M.D..

Q: What is Deanna Armstrong's specialty?

The primary specialty registered for this NPI is Psychiatry & Neurology, specializing in Psychiatry, with taxonomy code 2084P0800X.

Q: When was this NPI record last updated?

The NPPES record for Deanna Armstrong was last updated on May 6, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 years 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.

Active since October 03, 2006PECOS Enrolled

2755 COLONIAL DR, HELENA, MT 59601(406) 444-7500(406) 884-2085 Get Directions Write a Review

NPPES record last updated: May 6, 2024. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: May 6, 2024, Feb 28, 2022, May 17, 2018 (3 updates tracked since 2018).

On this page

About Dr. Deanna L. Armstrong M.d. NPPES

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

DR. DEANNA L. ARMSTRONG M.D. (NPI 1003900184) is an individual psychiatry provider in Helena, Montana, licensed in Montana (MED-PHYS-LIC-101070) and active in the NPI registry since October 2006. She is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1003900184

Entity TypeIndividualFemale

Primary Taxonomy2084P0800X

Provider Legal NameDR. DEANNA L. ARMSTRONGCredential: M.D.

Location Address2755 COLONIAL DRHelena, MT 59601-4926

Mailing AddressPo Box 5539Helena, MT 59604-5539 · (406) 238-2500 · Fax (406) 884-2085

Phone(406) 444-7500

Fax(406) 884-2085

Sole ProprietorYes

Enumeration DateOctober 3, 2006

Last NPPES UpdateMay 6, 20243 updates tracked since enumeration

NPPES CertifiedMay 6, 2024

✔ NPI 1003900184 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPsychiatry & Neurology · PsychiatryAllopathic & Osteopathic Physicians

Taxonomy Code2084P0800X

License✔ Licensed in MT · MED-PHYS-LIC-101070

Definition

A Psychiatrist specializes in the prevention, diagnosis, and treatment of mental disorders, emotional disorders, psychotic disorders, mood disorders, anxiety disorders, substance-related disorders, sexual and gender identity disorders and adjustment disorders. Biologic, psychological, and social components of illnesses are explored and understood in treatment of the whole person. Tools used may include diagnostic laboratory tests, prescribed medications, evaluation and treatment of psychological and interpersonal problems with individuals and families, and intervention for coping with stress, crises, and other problems.

2755 COLONIAL DR, Helena, MT 59601

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Other Names 1

Former Name (1)Deanna L. Munisteri M.d.

Other Identifiers 1

Medicaid1003900184WA

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Blue Cross and Blue Shield of Montana, Blue Cross and Blue Shield of Texas, Mountain Health CO-OP 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. Deanna L. Armstrong 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

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

Montana Children's Home & Hospital

Same address

Psychiatric Residential Treatment Facility

2755 COLONIAL DR
Helena, MT 59601

Reassigned Medicare billing, Montana enrollment
Medicare enrollment name: Montana Childrens Home & Hospital
50 clinicians in this Medicare group

NPI 1255704508 (406) 444-7500

Billings Clinic

176 mi

General Practice

801 N 29TH ST
Billings, MT 59101

Reassigned Medicare billing, Texas enrollment
13 clinicians in this Medicare group

NPI 1376598714 (406) 238-2500

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 59601 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

$172.26 typical visit price

range $56.81 – $172.26

Typical copayment $43.06 (range $14.20 – $43.06)

Most-billed visit code 99205

Established Patient

$70.82 typical visit price

range $18.24 – $140.32

Typical copayment $17.70 (range $4.56 – $35.08)

Most-billed visit code 99213

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 20

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

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