Quick answers
- Does Maritza Y. Estrada-O'Brien accept Medicare assignment?
- Yes. Medicare's clinician data says Maritza Y. Estrada-O'Brien 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 Maritza Y. Estrada-O'Brien see?
- In 2024, CMS data shows 195 Original Medicare patients and 374 services for Maritza Y. Estrada-O'Brien. This counts Original Medicare only and measures volume, not quality.
- What is Maritza Y. Estrada-O'Brien's NPI number?
- 1184187767. 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 Maritza Y. Estrada-O'Brien, 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 | 195 |
|---|---|
| Services billed to Medicare | 374 |
| Different services or procedures | 14 |
| Participating Medicare provider | Yes |
| Average age of these patients | 79 |
Most frequent services
- Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)162 services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)131 services
- Critical care, first 30-74 minutes (99291)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%
- Arthritis58%
- Heart failure51%
- Chronic kidney disease50%
- COPD46%
Hospitals where Maritza Y. Estrada-O'Brien works
Medicare's Facility Affiliation Data lists Maritza Y. Estrada-O'Brien 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.
- OSF Saint Clare Medical CenterPrinceton, IL · Critical Access Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 141337
- OSF Saint Elizabeth MDL CenterPeru, IL · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 140110
- OSF Saint Paul Medical CenterMendota, IL · Critical Access Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 141310
- Saint Anthony Medical CenterRockford, IL · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 140233
- Saint Francis Medical CenterPeoria, IL · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 140067
Practice locations
Addresses where Maritza Y. Estrada-O'Brien is enrolled with Medicare (CMS data updated October 2, 2026).
- 1401 E 12th StMendota, IL 61342 (815) 539‑7461
- 1404 Washington StMendota, IL 61342 (815) 539‑1825
- 1405 E 12th St, Suite 700Mendota, IL 61342 (815) 539‑2663
Group practices
Medicare enrollment lists Maritza Y. Estrada-O'Brien as a member of this group (CMS data updated October 2, 2026).
- Mendota Community Hospital51 clinicians in the group
Specialties
- Family Practiceprimary
Other family doctors in Mendota
Clinicians with the same Medicare primary specialty in Mendota, IL — not a recommendation.
Other clinicians in Mendota Community Hospital
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Illinois College Of Med (chi/peor/rock/chm-Urb) |
| Graduation year | 2019 (7 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1184187767 |
| 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