A. Thomas Siachos, M.D.
NPI 1598757171 · Cardiovascular Disease Physician · Greenville, SC
Enrolled with Medicare as Practitioner - Cardiovascular Disease (cardiology) · source: CMS PECOS Public Provider Enrollment (2026.04.01)
A. Thomas Siachos, M.D. is a Cardiovascular Disease Physician provider in Greenville, SC (NPI 1598757171).
Provider details
- NPI number
- 1598757171
- Entity type
- Individual
- Primary specialty
- Cardiovascular Disease PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 21670 (SC)
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
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
8,386 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 | 1,829 | $120 |
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Interpretation and Report Only93010 | 1,497 | $8 |
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Interpretation and Report93000 | 1,094 | $13 |
| Anticoagulant Management of Patient Taking Warfarin93793 | 610 | $11 |
| Blood Test, Clotting Time85610 | 386 | $4 |
| Evaluation of Single, Dual, Multiple Lead Or Leadless Pacemaker System, Remote Up to 90 Days93294 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 75 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Metoprolol Succinate | 1,266 | 411 |
| Atorvastatin Calcium | 893 | 281 |
| Apixabanbrand: Eliquis | 861 | 196 |
| Amlodipine Besylate | 629 | 200 |
| Losartan Potassium | 535 | 174 |
| Rosuvastatin Calcium | 460 | 147 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$506 across 32 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
- 2005-08-18
- Last updated
- 2010-02-12
Frequently asked questions
- What is A. Thomas Siachos's NPI number?
- A. Thomas Siachos's National Provider Identifier (NPI) is 1598757171, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is A. Thomas Siachos's specialty?
- A. Thomas Siachos is listed in the NPPES registry with a primary specialty of Cardiovascular Disease Physician (Allopathic & Osteopathic Physicians).
- Where is A. Thomas Siachos located?
- A. Thomas Siachos's practice location on file with NPPES is 2 Innovation Dr, Greenville, SC 29607-5261.
- What is A. Thomas Siachos's phone number?
- The practice phone number listed in the NPPES registry for A. Thomas Siachos is (864) 235-7665.
- Does A. Thomas Siachos accept Medicare?
- A. Thomas Siachos is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is A. Thomas Siachos's NPI active?
- Yes — A. Thomas Siachos's NPI (1598757171) is active in the NPPES registry as of the last update on 2010-02-12.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.