Charles Duncan, MD
NPI 1215932462 · Pulmonary Disease Physician · San Antonio, TX
Enrolled with Medicare as Practitioner - Critical Care (intensivists) · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Charles Duncan, MD is a Pulmonary Disease Physician provider in San Antonio, TX (NPI 1215932462).
Provider details
- NPI number
- 1215932462
- Entity type
- Individual
- Primary specialty
- Pulmonary Disease PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- H2115 (TX)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
21 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
771 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) |
|---|---|---|
| Test to Measure Expiratory Airflow and Volume Changes Before and After Medication Administration94060 | 230 | $36 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 211 | $85 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 73 | $118 |
| Test to Determine Lung Volumes Using Gas Dilution Or Washout94727 | 58 | $41 |
| Test to Examine How Well the Lungs Exchange Gases94729 | 58 | $51 |
| New Patient Office Or Other Outpatient Visit With Low Level of Medical Decision Making, If Using Time, 30 Minutes Or More99203 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 19 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Fluticasone/Umeclidin/Vilanterbrand: Trelegy Ellipta | 428 | 77 |
| Albuterol Sulfatebrand: Albuterol Sulfate Hfa | 244 | 85 |
| Prednisone | 111 | 68 |
| Montelukast Sodium | 80 | 21 |
| Fluticasone Propion/Salmeterolbrand: Fluticasone-Salmeterol | 69 | 24 |
| Doxycycline Hyclate | 44 | 29 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$1,972 across 93 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
- 2005-06-15
- Last updated
- 2025-08-12
- Certified
- 2025-08-12
Frequently asked questions
- What is Charles Duncan's NPI number?
- Charles Duncan's National Provider Identifier (NPI) is 1215932462, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Charles Duncan's specialty?
- Charles Duncan is listed in the NPPES registry with a primary specialty of Pulmonary Disease Physician (Allopathic & Osteopathic Physicians).
- Where is Charles Duncan located?
- Charles Duncan's practice location on file with NPPES is 10007 Huebner Rd Ste 402, San Antonio, TX 78240.
- What is Charles Duncan's phone number?
- The practice phone number listed in the NPPES registry for Charles Duncan is (210) 692-0361.
- Does Charles Duncan accept Medicare?
- Charles Duncan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Charles Duncan's NPI active?
- Yes — Charles Duncan's NPI (1215932462) is active in the NPPES registry as of the last update on 2025-08-12.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.