Mark Sij, D.O.
NPI 1396705919 · Internal Medicine Physician · Kaufman, TX
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Sij, D.O. is a Internal Medicine Physician provider in Kaufman, TX (NPI 1396705919).
Provider details
- NPI number
- 1396705919
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- D.O.
- Sex
- Male
- Sole proprietor
- No
- License
- K9421 (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
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
2,758 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) |
|---|---|---|
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Interpretation and Report Only93010 | 1,217 | $8 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 572 | $122 |
| 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 | 494 | $16 |
| Physician Or Allowed Practitioner Re-Certification for Medicare-Covered Home Health Services Under a Home Health Plan of Care (patient Not Present), Including Contacts With Home Health Agency and Review of Reports of Patient Status Required By Physicians aG0179 | 162 | $40 |
| Administration of Influenza Virus VaccineG0008 | 87 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 240 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 801 | 135 |
| Atorvastatin Calcium | 751 | 198 |
| Pantoprazole Sodium | 684 | 175 |
| Levothyroxine Sodium | 670 | 190 |
| Gabapentin | 641 | 149 |
| Amlodipine Besylate | 558 | 160 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$2,065 across 118 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
- 2006-03-27
- Last updated
- 2011-08-05
Frequently asked questions
- What is Mark Sij's NPI number?
- Mark Sij's National Provider Identifier (NPI) is 1396705919, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Sij's specialty?
- Mark Sij is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Sij located?
- Mark Sij's practice location on file with NPPES is 874 Ed Hall Dr Ste B-108, Kaufman, TX 75142-1861.
- What is Mark Sij's phone number?
- The practice phone number listed in the NPPES registry for Mark Sij is (972) 932-5555.
- Does Mark Sij accept Medicare?
- Mark Sij is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Sij's NPI active?
- Yes — Mark Sij's NPI (1396705919) is active in the NPPES registry as of the last update on 2011-08-05.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.