Quick answers
- Does Marni G. Underwood accept Medicare assignment?
- Yes. Medicare's clinician data says Marni G. Underwood 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 Marni G. Underwood see?
- In 2024, CMS data shows 97 Original Medicare patients and 315 services for Marni G. Underwood. This counts Original Medicare only and measures volume, not quality.
- What is Marni G. Underwood's NPI number?
- 1891797304. 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 Marni G. Underwood, 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 | 97 |
|---|---|
| Services billed to Medicare | 315 |
| Different services or procedures | 28 |
| Participating Medicare provider | Yes |
| Average age of these patients | 72 |
Most frequent services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)71 services
- Injection, dexamethasone sodium phosphate, 1 mg (J1100)71 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)31 services
- Injection of drug or substance under skin or into muscle (96372)23 services
- Amplifed dna or rna probe detection of severe acute respiratory syndrome coronavirus 2 (covid-19) antigen (87635)19 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%
- Arthritis39%
- Ischemic heart disease38%
- Diabetes29%
- Anxiety27%
Practice locations
Addresses where Marni G. Underwood is enrolled with Medicare (CMS data updated October 2, 2026).
- 1650 Texas Ave, Suite EBridge City, TX 77611 (833) 698‑6825
- 1650 Texas Ave, Suite GBridge City, TX 77611 (833) 698‑6825
Group practices
Medicare enrollment lists Marni G. Underwood as a member of these groups (CMS data updated October 2, 2026).
- Acorn Medical Home5 clinicians in the group
- Total Care Medical, PLLC4 clinicians in the group
Specialties
- Nurse Practitionerprimary
Other nurse practitioners in Bridge City
Clinicians with the same Medicare primary specialty in Bridge City, TX — not a recommendation.
Other clinicians in Acorn Medical Home
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | NP |
|---|---|
| Graduation year | 2001 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1891797304 |
| 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
- 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