Quick answers
- Does Alexandra S. Heerdt accept Medicare assignment?
- Yes. Medicare's clinician data says Alexandra S. Heerdt 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 Alexandra S. Heerdt see?
- In 2024, CMS data shows 622 Original Medicare patients and 924 services for Alexandra S. Heerdt. This counts Original Medicare only and measures volume, not quality.
- What is Alexandra S. Heerdt's NPI number?
- 1114906591. 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 Alexandra S. Heerdt, 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 | 622 |
|---|---|
| Services billed to Medicare | 924 |
| Different services or procedures | 15 |
| 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)610 services
- Partial removal of breast (19301)90 services
- New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more (99205)67 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)31 services
- Biopsy or removal of deep lymph nodes of underarm (38525)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 cholesterol75%
- Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)75%
- High blood pressure60%
- Arthritis52%
- Osteoporosis39%
- Anxiety25%
Practice locations
Addresses where Alexandra S. Heerdt is enrolled with Medicare (CMS data updated October 2, 2026).
- 1133 York AveNew York, NY 10065 (646) 888‑7100
- 1275 York AveNew York, NY 10065 (212) 639‑2000
- 300 E 66th StNew York, NY 10065 (646) 888‑5200
Group practices
Medicare enrollment lists Alexandra S. Heerdt as a member of this group (CMS data updated October 2, 2026).
- MSKCC Surgery Group369 clinicians in the group
Specialties
- General Surgeryprimary
Other general surgeons in New York
Clinicians with the same Medicare primary specialty in New York, NY — not a recommendation.
Other clinicians in MSKCC Surgery Group
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Jefferson Medical College Of Thomas Jefferson University |
| Graduation year | 1987 (39 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1114906591 |
| 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