Mark Bertsch, FNP
NPI 1649005620 · Family Nurse Practitioner · Port Jefferson, NY
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Bertsch, FNP is a Family Nurse Practitioner provider in Port Jefferson, NY (NPI 1649005620).
Provider details
- NPI number
- 1649005620
- Entity type
- Individual
- Primary specialty
- Family Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- FNP
- Sex
- Male
- Sole proprietor
- Yes
- License
- 354320 (NY)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
1 yr in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
31 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 20 | $63 |
| Initial Hospital Care With Straightforward Or Low Level of Medical Decision Making, Per Day, If Using Time, at Least 40 Minutes99221 | 11 | $80 |
Typical Medicare-allowed amounts for these services range $63–$80 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
Practice location
Mailing address
Registry dates
- Enumerated
- 2024-09-07
- Last updated
- 2024-09-09
- Certified
- 2024-09-09
Frequently asked questions
- What is Mark Bertsch's NPI number?
- Mark Bertsch's National Provider Identifier (NPI) is 1649005620, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Bertsch's specialty?
- Mark Bertsch is listed in the NPPES registry with a primary specialty of Family Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Mark Bertsch located?
- Mark Bertsch's practice location on file with NPPES is 200 Belle Terre Rd, Port Jefferson, NY 11777-1928.
- What is Mark Bertsch's phone number?
- The practice phone number listed in the NPPES registry for Mark Bertsch is (631) 474-6000.
- Does Mark Bertsch accept Medicare?
- Mark Bertsch is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Bertsch's NPI active?
- Yes — Mark Bertsch's NPI (1649005620) is active in the NPPES registry as of the last update on 2024-09-09.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.