Quick answers
- Does Marisa N. Guillory accept Medicare assignment?
- Yes. Medicare's clinician data says Marisa N. Guillory accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Marisa N. Guillory see?
- In 2024, CMS data shows 588 Original Medicare patients and 867 services for Marisa N. Guillory. This counts Original Medicare only and measures volume, not quality.
- What is Marisa N. Guillory's NPI number?
- 1942429279. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Marisa N. Guillory, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 588 |
|---|---|
| Services billed to Medicare | 867 |
| Different services or procedures | 18 |
| Participating Medicare provider | Yes |
| Average age of these patients | 73 |
Most frequent services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)419 services
- Sleep study including heart rate, breathing, airflow, and effort (95806)130 services
- New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)104 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)89 services
- Sleep study in sleep lab with continuous airway pressure (6 years or older) (95811)31 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High blood pressure75%
- High cholesterol75%
- Arthritis52%
- Ischemic heart disease36%
- Diabetes34%
- Atrial fibrillation30%
Hospitals where Marisa N. Guillory works
Medicare's Facility Affiliation Data lists Marisa N. Guillory at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- CHRISTUS Good Shepherd Medical CenterLongview, TX · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 450032
Practice locations
Addresses where Marisa N. Guillory is enrolled with Medicare (CMS data updated October 2, 2026).
- 912 Walnut Hill DrLongview, TX 75605 (903) 212‑9456
Group practices
Medicare enrollment lists Marisa N. Guillory as a member of this group (CMS data updated October 2, 2026).
- Ryan M Guillory MD PA6 clinicians in the group
Specialties
- Pediatric Medicineprimary
Other pediatricians in Texas
Clinicians with the same Medicare primary specialty in Texas — not a recommendation.
Other clinicians in Ryan M Guillory MD PA
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Texas Southwestern Medical School At Dallas |
| Graduation year | 2006 (20 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1942429279 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians