Mark Farnie, M.D.
NPI 1578596516 · Internal Medicine Physician · Houston, TX
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Farnie, M.D. is a Internal Medicine Physician provider in Houston, TX (NPI 1578596516).
Provider details
- NPI number
- 1578596516
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- H4313 (TX)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
97 Medicare services, 2024 (ranked within specialty)
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 methodology.
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 Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 73 | $91 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 24 | $133 |
Typical Medicare-allowed amounts for these services range $91–$133 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 50 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 192 | 66 |
| Lisinopril | 119 | 40 |
| Amlodipine Besylate | 98 | 36 |
| Levothyroxine Sodium | 80 | 23 |
| Hydrochlorothiazide | 73 | 24 |
| Gabapentin | 71 | 23 |
| Pantoprazole Sodium |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-07-09
- Last updated
- 2023-12-28
- Certified
- 2023-12-28
Frequently asked questions
- What is Mark Farnie's NPI number?
- Mark Farnie's National Provider Identifier (NPI) is 1578596516, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Farnie's specialty?
- Mark Farnie is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Farnie located?
- Mark Farnie's practice location on file with NPPES is 6410 Fannin St, Houston, TX 77030-3000.
- What is Mark Farnie's phone number?
- The practice phone number listed in the NPPES registry for Mark Farnie is (832) 325-7100.
- Does Mark Farnie accept Medicare?
- Mark Farnie is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Farnie's NPI active?
- Yes — Mark Farnie's NPI (1578596516) is active in the NPPES registry as of the last update on 2023-12-28.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.