Quick answers
- Does Lauren D. Brennan accept Medicare assignment?
- Yes. Medicare's clinician data says Lauren D. Brennan 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 Lauren D. Brennan see?
- In 2024, CMS data shows 542 Original Medicare patients and 715 services for Lauren D. Brennan. This counts Original Medicare only and measures volume, not quality.
- What is Lauren D. Brennan's NPI number?
- 1801564646. 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 Lauren D. Brennan, 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 | 542 |
|---|---|
| Services billed to Medicare | 715 |
| Different services or procedures | 12 |
| Participating Medicare provider | Yes |
| Average age of these patients | 74 |
Most frequent services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)367 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)135 services
- New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more (99203)104 services
- New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)69 services
- Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more (99212)28 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 cholesterol75%
- High blood pressure70%
- Arthritis55%
- Anxiety30%
- Diabetes26%
- Ischemic heart disease25%
Hospitals where Lauren D. Brennan works
Medicare's Facility Affiliation Data lists Lauren D. Brennan 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.
- The Johns Hopkins HospitalBaltimore, MD · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 210009
Practice locations
Addresses where Lauren D. Brennan is enrolled with Medicare (CMS data updated October 2, 2026).
- 6201 Greenleigh AveMiddle River, MD 21220
Specialties
- Nurse Practitionerprimary
Other nurse practitioners in Middle River
Clinicians with the same Medicare primary specialty in Middle River, MD — not a recommendation.
Clinician information
| Credential | NP |
|---|---|
| School | George Washington University School Of Medicine |
| Graduation year | 2021 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1801564646 |
| 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