Daniel Callahan, M.D.
NPI 1598761223 · Pulmonary Disease Physician · Alpharetta, GA
Enrolled with Medicare as Practitioner - Pulmonary Disease · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Daniel Callahan, M.D. is a Pulmonary Disease Physician provider in Alpharetta, GA (NPI 1598761223).
Provider details
- NPI number
- 1598761223
- Entity type
- Individual
- Primary specialty
- Pulmonary Disease PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 033044 (GA)
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
1,125 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 Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 392 | $89 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 146 | $124 |
| Sleep Study Including Heart Rate, Breathing, Airflow, and Effort95806 | 120 | $43 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 96 | $116 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 62 | $77 |
| New Patient Office Or Other Outpatient Visit With Low Level of Medical Decision Making, If Using Time, 30 Minutes Or More |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 45 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Fluticasone/Umeclidin/Vilanterbrand: Trelegy Ellipta | 173 | 39 |
| Albuterol Sulfatebrand: Albuterol Sulfate Hfa | 144 | 55 |
| Prednisone | 130 | 63 |
| Montelukast Sodium | 126 | 42 |
| Azithromycin | 85 | 37 |
| Trazodone Hcl | 67 | 24 |
| Fluticasone/Vilanterol |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$1,842 across 83 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
- 2005-06-27
- Last updated
- 2021-04-26
- Certified
- 2021-04-26
Frequently asked questions
- What is Daniel Callahan's NPI number?
- Daniel Callahan's National Provider Identifier (NPI) is 1598761223, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Daniel Callahan's specialty?
- Daniel Callahan is listed in the NPPES registry with a primary specialty of Pulmonary Disease Physician (Allopathic & Osteopathic Physicians).
- Where is Daniel Callahan located?
- Daniel Callahan's practice location on file with NPPES is 3400 Old Milton Pkwy # C, Alpharetta, GA 30005-3707.
- What is Daniel Callahan's phone number?
- The practice phone number listed in the NPPES registry for Daniel Callahan is (770) 343-8760.
- Does Daniel Callahan accept Medicare?
- Daniel Callahan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Daniel Callahan's NPI active?
- Yes — Daniel Callahan's NPI (1598761223) is active in the NPPES registry as of the last update on 2021-04-26.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.