David Guan, M.D.
NPI 1891772208 · Pulmonary Disease Physician · Chattanooga, TN
Enrolled with Medicare as Practitioner - Pulmonary Disease · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Provider details
- NPI number
- 1891772208
- Entity type
- Individual
- Primary specialty
- Pulmonary Disease PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 056561 (GA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
20 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
5 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
381 Medicare services, 2024 (ranked within specialty)
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 methodology.
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 | 90 | $73 |
| Critical Care, First 30-74 Minutes99291 | 76 | $196 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 67 | $110 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 37 | $110 |
| Aspiration of Initial Secretion of Lung Airway Using an Endoscope31645 | 29 | $132 |
| Initial Hospital Care With Straightforward Or Low-Level Medical Decision Making, If Using Time, at Least 55 Minutes99222 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 15 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Zolpidem Tartrate | 110 | 14 |
| Albuterol Sulfatebrand: Albuterol Sulfate Hfa | 105 | 22 |
| Dextroamphetamine/Amphetaminebrand: Dextroamphetamine-Amphetamine | 48 | — |
| Methylphenidate Hcl | 43 | — |
| Clonazepam | 26 | — |
| Umeclidinium Brm/Vilanterol Trbrand: Anoro Ellipta | 24 |
Practice location
Mailing address
Additional practice locations (4)
- 3327 Chamblee Dunwoody RdAtlanta, GA 30341-2816Phone: (423) 208-9030Fax: (800) 875-1815
- 246 Pleasant St.Memorial Building, West, Ground FloorConcord, NH 03301-2548Phone: (603) 224-9661Fax: (603) 227-7528
- 1702 W Madison AveAthens, TN 37303-4033Phone: (423) 208-9030Fax: (800) 875-1815
- 1332 Market StDayton, TN 37321-1266Phone: (423) 208-9030Fax: (800) 875-1815
Registry dates
- Enumerated
- 2005-12-28
- Last updated
- 2023-06-07
- Certified
- 2023-06-07
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.