Eugene Ryan, MD
NPI 1609865088 · Internal Medicine Physician · Chattanooga, TN
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Eugene Ryan, MD is a Internal Medicine Physician provider in Chattanooga, TN (NPI 1609865088).
Provider details
- NPI number
- 1609865088
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 28488 (TN)
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
20 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
1,046 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 | 313 | $118 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 170 | $73 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 138 | $110 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 102 | $120 |
| Hospital Discharge Day Management, More Than 30 Minutes99239 | 63 | $106 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 117 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Amlodipine Besylate | 407 | 120 |
| Atorvastatin Calcium | 404 | 136 |
| Lisinopril | 309 | 105 |
| Levothyroxine Sodium | 306 | 88 |
| Omeprazole | 294 | 92 |
| Rosuvastatin Calcium | 221 | 70 |
| Metformin Hcl |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$1,884 across 21 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
- 2005-10-18
- Last updated
- 2022-02-10
Frequently asked questions
- What is Eugene Ryan's NPI number?
- Eugene Ryan's National Provider Identifier (NPI) is 1609865088, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Eugene Ryan's specialty?
- Eugene Ryan is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Eugene Ryan located?
- Eugene Ryan's practice location on file with NPPES is 2205 Mccallie Ave, Chattanooga, TN 37404-3230.
- What is Eugene Ryan's phone number?
- The practice phone number listed in the NPPES registry for Eugene Ryan is (423) 698-2435.
- Does Eugene Ryan accept Medicare?
- Eugene Ryan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Eugene Ryan's NPI active?
- Yes — Eugene Ryan's NPI (1609865088) is active in the NPPES registry as of the last update on 2022-02-10.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.