Theodoros Voloyiannis, M.D.
NPI 1891911228 · Colon & Rectal Surgery Physician · Houston, TX
Enrolled with Medicare as Practitioner - Colorectal Surgery (proctology) · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Theodoros Voloyiannis, M.D. is a Colon & Rectal Surgery Physician provider in Houston, TX (NPI 1891911228).
Provider details
- NPI number
- 1891911228
- Entity type
- Individual
- Primary specialty
- Colon & Rectal Surgery PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- M2858 (TX)
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
19 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
333 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) |
|---|---|---|
| Diagnostic Exam of Rectum and Lower Large Bowel Using an Endoscope45300 | 71 | $124 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 54 | $91 |
| New Patient Office Or Other Outpatient Visit With a High Level of Medical Decision Making, If Using Time, 60 Minutes Or More99205 | 38 | $213 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 30 | $129 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 26 | $169 |
| Diagnostic Exam of Anus Using an Endoscope46600 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 7 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Metronidazole | 98 | 90 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 77 | 62 |
| Neomycin Sulfate | 72 | 69 |
| Sod Picosulf/Mag Ox/Citric Acbrand: Clenpiq | 50 | 48 |
| Sodium, Potassium,mag Sulfatesbrand: Sod Sulf-Potass Sulf-Mag Sulf | 29 | 25 |
| Tramadol Hcl | 18 | 16 |
| Peg3350/Sod Sulf,bicarb,cl/Kcl |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$32,644 across 24 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
Additional practice locations (1)
- 400 W Medical Center Blvd Ste 205Webster, TX 77598-4227Phone: (832) 932-1720Fax: (281) 332-7616
Registry dates
- Enumerated
- 2007-04-17
- Last updated
- 2019-04-15
Frequently asked questions
- What is Theodoros Voloyiannis's NPI number?
- Theodoros Voloyiannis's National Provider Identifier (NPI) is 1891911228, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Theodoros Voloyiannis's specialty?
- Theodoros Voloyiannis is listed in the NPPES registry with a primary specialty of Colon & Rectal Surgery Physician (Allopathic & Osteopathic Physicians).
- Where is Theodoros Voloyiannis located?
- Theodoros Voloyiannis's practice location on file with NPPES is 7400 Fannin St Ste 1295, Houston, TX 77054-1934.
- What is Theodoros Voloyiannis's phone number?
- The practice phone number listed in the NPPES registry for Theodoros Voloyiannis is (832) 377-3770.
- Does Theodoros Voloyiannis accept Medicare?
- Theodoros Voloyiannis is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Theodoros Voloyiannis's NPI active?
- Yes — Theodoros Voloyiannis's NPI (1891911228) is active in the NPPES registry as of the last update on 2019-04-15.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.