Quick answers
- Does Mariann Harrington accept Medicare assignment?
- Yes. Medicare's clinician data says Mariann Harrington 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 Mariann Harrington see?
- In 2024, CMS data shows 1,289 Original Medicare patients and 259,538 services for Mariann Harrington. This counts Original Medicare only and measures volume, not quality.
- What is Mariann Harrington's NPI number?
- 1184606071. 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 Mariann Harrington, 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 | 1,289 |
|---|---|
| Services billed to Medicare | 259,538 |
| Different services or procedures | 215 |
| Participating Medicare provider | Yes |
| Average age of these patients | 75 |
Most frequent services
- Injection, pembrolizumab, 1 mg (J9271)28,600 services
- Injection, filgrastim-ayow, biosimilar, (releuko), 1 microgram (Q5125)24,060 services
- Injection, nivolumab, 1 mg (J9299)11,440 services
- Injection, ferumoxytol, for treatment of iron deficiency anemia, 1 mg (non-esrd use) (Q0138)9,180 services
- Injection, aprepitant, 1 mg (J0185)9,100 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 cholesterol70%
- Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)58%
- Arthritis49%
- Ischemic heart disease36%
- Diabetes32%
Hospitals where Mariann Harrington works
Medicare's Facility Affiliation Data lists Mariann Harrington 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.
- Baptist Health Medical Center-Hot Springs CountyMalvern, AR · Acute Care Hospital · Emergency services: listed by Medicare · CCN 040076
- Baptist Health Medical Center-Little RockLittle Rock, AR · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 040114
- Bradley County Medical CenterWarren, AR · Critical Access Hospital · Emergency services: listed by Medicare · CCN 041327
- Saline Memorial HospitalBenton, AR · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 040084
Practice locations
Addresses where Mariann Harrington is enrolled with Medicare (CMS data updated October 2, 2026). The first 5 of 7; the Medicare profile lists all.
- 10411 W Markham StLittle Rock, AR 72205 (501) 906‑3000
- 1505 N Medical DrStuttgart, AR 72160 (501) 906‑3000
- 2500 Hwy 65 SClinton, AR 72031 (501) 906‑3000
- 2605 College AveConway, AR 72034 (501) 906‑3000
- 3121 N Reynolds Rd, Suite 1Bryant, AR 72022 (501) 906‑3000
Group practices
Medicare enrollment lists Mariann Harrington as a member of this group (CMS data updated October 2, 2026).
- Central Arkansas Radiation Therapy Institute Inc90 clinicians in the group
Specialties
- Hematology/Oncologyprimary
Other hematologist-oncologists in Little Rock
Clinicians with the same Medicare primary specialty in Little Rock, AR — not a recommendation.
Other clinicians in Central Arkansas Radiation Therapy Institute Inc
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Arkansas College Of Medicine |
| Graduation year | 1980 (46 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1184606071 |
| 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