Johnathan Fagg, MD
NPI 1811427636 · Pulmonary Disease Physician · Saint Louis, MO
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Johnathan Fagg, MD is a Pulmonary Disease Physician provider in Saint Louis, MO (NPI 1811427636).
Provider details
- NPI number
- 1811427636
- Entity type
- Individual
- Primary specialty
- Pulmonary Disease PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 036153001 (IL)
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
9 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
925 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) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 277 | $75 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 105 | $161 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 92 | $86 |
| Test to Examine How Well the Lungs Exchange Gases94729 | 89 | $8 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 81 | $119 |
| Test to Determine Lung Volumes Using Sensors94726 |
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 |
|---|---|---|
| Albuterol Sulfatebrand: Albuterol Sulfate Hfa | 184 | 80 |
| Fluticasone/Umeclidin/Vilanterbrand: Trelegy Ellipta | 140 | 33 |
| Prednisone | 51 | 26 |
| Omeprazole | 45 | 19 |
| Fluticasone Propionate | 41 | 18 |
| Fluticasone Propion/Salmeterolbrand: Wixela Inhub | 29 | 12 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$345 across 6 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
- 2017-06-14
- Last updated
- 2023-10-05
- Certified
- 2023-10-05
Frequently asked questions
- What is Johnathan Fagg's NPI number?
- Johnathan Fagg's National Provider Identifier (NPI) is 1811427636, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Johnathan Fagg's specialty?
- Johnathan Fagg is listed in the NPPES registry with a primary specialty of Pulmonary Disease Physician (Allopathic & Osteopathic Physicians).
- Where is Johnathan Fagg located?
- Johnathan Fagg's practice location on file with NPPES is 621 S New Ballas Rd Ste 228a, Saint Louis, MO 63141-8256.
- What is Johnathan Fagg's phone number?
- The practice phone number listed in the NPPES registry for Johnathan Fagg is (314) 251-4968.
- Does Johnathan Fagg accept Medicare?
- Johnathan Fagg is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Johnathan Fagg's NPI active?
- Yes — Johnathan Fagg's NPI (1811427636) is active in the NPPES registry as of the last update on 2023-10-05.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.