Siobhan Duff, MD
NPI 1588638910 · Family Medicine Physician · Chattanooga, TN
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Siobhan Duff, MD is a Family Medicine Physician provider in Chattanooga, TN (NPI 1588638910).
Provider details
- NPI number
- 1588638910
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- 25566 (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
4,506 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 | 775 | $118 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 648 | $15 |
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 394 | $8 |
| Blood Test, Comprehensive Group of Blood Chemicals80053 | 327 | $10 |
| Blood Test, Lipids (cholesterol and Triglycerides)80061 | 323 | $13 |
| Hemoglobin A1c Level83036 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 138 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Levothyroxine Sodium | 436 | 133 |
| Lisinopril | 425 | 118 |
| Rosuvastatin Calcium | 424 | 142 |
| Omeprazole | 350 | 107 |
| Amlodipine Besylate | 299 | 86 |
| Atorvastatin Calcium | 288 | 94 |
| Losartan Potassium |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$1,458 across 79 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
- 2006-02-14
- Last updated
- 2024-05-16
- Certified
- 2024-05-16
Frequently asked questions
- What is Siobhan Duff's NPI number?
- Siobhan Duff's National Provider Identifier (NPI) is 1588638910, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Siobhan Duff's specialty?
- Siobhan Duff is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Siobhan Duff located?
- Siobhan Duff's practice location on file with NPPES is 961 Spring Creek Rd, Chattanooga, TN 37412-3959.
- What is Siobhan Duff's phone number?
- The practice phone number listed in the NPPES registry for Siobhan Duff is (423) 892-2221.
- Does Siobhan Duff accept Medicare?
- Siobhan Duff is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Siobhan Duff's NPI active?
- Yes — Siobhan Duff's NPI (1588638910) is active in the NPPES registry as of the last update on 2024-05-16.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.