Charles Armstrong, DO
NPI 1255743548 · Family Medicine Physician · Chandler, AZ
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Charles Armstrong, DO is a Family Medicine Physician provider in Chandler, AZ (NPI 1255743548).
Provider details
- NPI number
- 1255743548
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- DO
- Sex
- Male
- Sole proprietor
- Yes
- License
- 007217 (AZ)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
12 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
331 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 143 | $120 |
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 51 | $9 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 36 | $156 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 33 | $85 |
| Detection Test By Immunoassay With Direct Visual Observation for Influenza Virus87804 | 25 | $16 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'S |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 13 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 45 | 14 |
| Rosuvastatin Calcium | 40 | 16 |
| Amlodipine Besylate | 40 | 15 |
| Lisinopril | 33 | — |
| Metformin Hcl | 31 | 12 |
| Levothyroxine Sodium | 26 | 11 |
| Losartan Potassium |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$54 across 3 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2014-05-21
- Last updated
- 2026-05-12
- Certified
- 2026-05-12
Frequently asked questions
- What is Charles Armstrong's NPI number?
- Charles Armstrong's National Provider Identifier (NPI) is 1255743548, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Charles Armstrong's specialty?
- Charles Armstrong is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Charles Armstrong located?
- Charles Armstrong's practice location on file with NPPES is 595 N Dobson Rd Ste D-65, Chandler, AZ 85224-4226.
- What is Charles Armstrong's phone number?
- The practice phone number listed in the NPPES registry for Charles Armstrong is (480) 718-1300.
- Does Charles Armstrong accept Medicare?
- Charles Armstrong is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Charles Armstrong's NPI active?
- Yes — Charles Armstrong's NPI (1255743548) is active in the NPPES registry as of the last update on 2026-05-12.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.