Quick answers
- Does Niels Krejci accept Medicare assignment?
- Yes. Medicare's clinician data says Niels Krejci 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 Niels Krejci see?
- In 2024, CMS data shows 539 Original Medicare patients and 1,635 services for Niels Krejci. This counts Original Medicare only and measures volume, not quality.
- What is Niels Krejci's NPI number?
- 1518958289. 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 Niels Krejci, 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 | 539 |
|---|---|
| Services billed to Medicare | 1,635 |
| Different services or procedures | 43 |
| Participating Medicare provider | Yes |
| Average age of these patients | 79 |
Most frequent services
- Removal and microscopic exam of growth of head, neck, hands, feet, or genitals, 1-5 tissue blocks (17311)496 services
- Removal and microscopic exam of growth of head, neck, hands, feet, or genitals, each additional stage, 1-5 tissue blocks (17312)213 services
- Intermediate repair of wound of scalp, underarms, trunk, arms, or legs, 2.6-7.5 cm (12032)188 services
- Intermediate repair of wound of face, ears, eyelids, nose, lips, or mouth, 2.6-5.0 cm (12052)186 services
- Removal and microscopic exam of growth of trunk, arms, or legs, 1-5 tissue blocks (17313)136 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%
- Arthritis41%
- Chronic kidney disease26%
- Diabetes24%
- Ischemic heart disease24%
Practice locations
Addresses where Niels Krejci is enrolled with Medicare (CMS data updated October 2, 2026).
- 440 E Central St, Suite 4Franklin, MA 02038 (781) 762‑5858
Group practices
Medicare enrollment lists Niels Krejci as a member of this group (CMS data updated October 2, 2026).
- Dermatology Associates PC19 clinicians in the group
Specialties
- Dermatologyprimary
Other dermatologists in Massachusetts
Clinicians with the same Medicare primary specialty in Massachusetts — not a recommendation.
Other clinicians in Dermatology Associates PC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1986 (40 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1518958289 |
| 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