Quick answers
- Does Megan Mastalerz accept Medicare assignment?
- Medicare's clinician data says Megan Mastalerz may accept Medicare assignment (as of October 2, 2026). Ask the office whether they accept it for your visit.
- How many Medicare patients does Megan Mastalerz see?
- In 2024, CMS data shows 30 Original Medicare patients and 114 services for Megan Mastalerz. This counts Original Medicare only and measures volume, not quality.
- What is Megan Mastalerz's NPI number?
- 1669728168. 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 Megan Mastalerz, 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 | 30 |
|---|---|
| Services billed to Medicare | 114 |
| Different services or procedures | 5 |
| Participating Medicare provider | Yes |
| Average age of these patients | 66 |
Most frequent services
- Exam of neurobehavioral status, each additional hour (96121)27 services
- Exam of neurobehavioral status, first hour (96116)24 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%
- Heart failure67%
- Ischemic heart disease63%
- Anxiety63%
- Chronic kidney disease63%
Hospitals where Megan Mastalerz works
Medicare's Facility Affiliation Data lists Megan Mastalerz 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 Megan Mastalerz is enrolled with Medicare (CMS data updated October 2, 2026).
- 600 N Wolf StBaltimore, MD 21287 (410) 955‑5000
Group practices
Medicare enrollment lists Megan Mastalerz as a member of this group (CMS data updated October 2, 2026).
- Johns Hopkins University2,909 clinicians in the group
Specialties
- Clinical Psychologistprimary
Other clinical psychologists in Baltimore
Clinicians with the same Medicare primary specialty in Baltimore, MD — not a recommendation.
Other clinicians in Johns Hopkins University
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | CP |
|---|---|
| Graduation year | 2012 |
| Gender (as listed) | Female |
| Medicare assignment | May accept for some services |
| NPI (National Provider Identifier) | 1669728168 |
| 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