Quick answers
- Does Mary J. Keegan accept Medicare assignment?
- Yes. Medicare's clinician data says Mary J. Keegan 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 Mary J. Keegan see?
- In 2024, CMS data shows 229 Original Medicare patients and 580 services for Mary J. Keegan. This counts Original Medicare only and measures volume, not quality.
- What is Mary J. Keegan's NPI number?
- 1336157213. 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 Mary J. Keegan, 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 | 229 |
|---|---|
| Services billed to Medicare | 580 |
| Different services or procedures | 17 |
| Participating Medicare provider | Yes |
| Average age of these patients | 73 |
Most frequent services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)199 services
- Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report (93000)98 services
- Management using the results of remote vital sign monitoring per calendar month, first 20 minutes (99457)55 services
- Remote monitoring of physiologic parameters, initial supply of devices with daily recordings or programmed alerts transmission, each 30 days (99454)47 services
- New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)29 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%
- Arthritis54%
- Ischemic heart disease46%
- Diabetes39%
- Heart failure31%
Practice locations
Addresses where Mary J. Keegan is enrolled with Medicare (CMS data updated October 2, 2026).
- 130 Westmount DrFarmington, MO 63640 (573) 756‑1813
Group practices
Medicare enrollment lists Mary J. Keegan as a member of this group (CMS data updated October 2, 2026).
- Heart and Vascular Associates LLC6 clinicians in the group
Specialties
- Nurse Practitionerprimary
Other nurse practitioners in Farmington
Clinicians with the same Medicare primary specialty in Farmington, MO — not a recommendation.
Other clinicians in Heart and Vascular Associates LLC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | NP |
|---|---|
| Graduation year | 1986 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1336157213 |
| 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