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MRS. MARYN KRAMERZ FNP-BC
NPI 1487396016
Nurse Practitioner - Family in Cambridge, MA

Active since April 13, 2022PECOS Enrolled
725 CONCORD AVE, CAMBRIDGE, MA 02138(617) 661-4600(617) 547-9170 Get Directions Write a Review

NPPES record last updated: November 12, 2025. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Nov 12, 2025, Apr 13, 2022 (2 updates tracked since 2022).

About Mrs. Maryn Kramerz Fnp-bc NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

MRS. MARYN KRAMERZ FNP-BC (NPI 1487396016) is an individual family provider in Cambridge, Massachusetts, licensed in Massachusetts (RN2330388) and active in the NPI registry since April 2022. She is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1487396016
Entity TypeIndividualFemale
Primary Taxonomy363LF0000X
Provider Legal NameMRS. MARYN KRAMERZCredential: FNP-BC
Location Address725 CONCORD AVECambridge, MA 02138-1040
Mailing Address725 Concord AveCambridge, MA 02138-1040 · (617) 661-4600 · Fax (617) 547-9170
Phone(617) 661-4600
Fax(617) 547-9170
Sole ProprietorNo
Enumeration DateApril 13, 2022
Last NPPES UpdateNovember 12, 20252 updates tracked since enumeration
NPPES CertifiedNovember 12, 2025
✔ NPI 1487396016 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyNurse Practitioner · FamilyPhysician Assistants & Advanced Practice Nursing Providers
Taxonomy Code363LF0000X
License✔ Licensed in MA · RN2330388
725 CONCORD AVE, Cambridge, MA 02138
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Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Mrs. Maryn Kramerz Fnp-bc is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignment

Medicare enrollment records show Maryn Kramerz reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Reservoir Medical Associates, P.C.
Same address
Internal Medicine
725 CONCORD AVE, SUITE 2000
Cambridge, MA 02138
  • Reassigned Medicare billing, Massachusetts enrollment
  • Medicare enrollment name: Reservoir Medical Associates PC
  • 4 clinicians in this Medicare group
NPI 1356399562 (617) 661-4600

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 6

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213
This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.
186 services151 patients
Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214
This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.
86 services75 patients
Insertion of needle into vein for collection of blood sample 36415
This procedure involves inserting a small needle into a vein, typically in your arm, to collect a blood sample. It's a quick and simple process to help diagnose or monitor health conditions. You may feel a small prick, but discomfort is minimal.
38 services33 patients
Amplifed dna or rna probe detection of severe acute respiratory syndrome coronavirus 2 (covid-19) antigen 87635
This is a lab test that detects the presence of COVID-19 in your body. It uses a technique to amplify the virus's genetic material, either DNA or RNA, making it easier to identify. A positive result indicates an active infection.
35 services34 patients
Urinalysis, manual test 81002
A urinalysis is a simple, non-invasive test that checks the urine for various elements such as sugar, protein, and signs of infection. It can help detect many common conditions, including kidney disease and diabetes. The manual test involves a lab technician examining a urine sample.
25 services25 patients
Detection test by immunoassay with direct visual observation for influenza virus 87804
This is a test that identifies the influenza virus in your body. It works by using an immunoassay, a method that detects the presence of the virus through an immune response. The results are directly observable, making it a quick and efficient way to diagnose flu.
11 services11 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 02138 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$97.64 typical visit price
range $63.72 – $189.86
Typical copayment $24.41 (range $15.93 – $47.46)
Most-billed visit code 99203
Established Patient
$111.18 typical visit price
range $21.07 – $155.29
Typical copayment $27.79 (range $5.26 – $38.82)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

MT AUBURN PROFESSIONAL SERVICES
Internal Medicine
725 CONCORD AVE, SUITE 4100
CAMBRIDGE, MA 02138
Middlesex County (617) 864-8822
DR. CATHARINE M. MINTZER M.D.
Internal Medicine
725 CONCORD AVE, SUITE 4100
CAMBRIDGE, MA 02138
Middlesex County (617) 864-8822
CHRISTOS A.HASIOTIS,MD.PC
Specialist
725 CONCORD AVE, SUITE 4500
CAMBRIDGE, MA 02138
Middlesex County (617) 864-3800
DR. EMAN ELKADRY MD
Obstetrics & Gynecology (Urogynecology and Reconstructive Pelvic Surgery)
725 CONCORD AVE, STE 3300
CAMBRIDGE, MA 02138
Middlesex County (617) 354-5452
DR. VIRGINIA H. PALAZZO M.D.
Internal Medicine
725 CONCORD AVE, SUITE 4100
CAMBRIDGE, MA 02138
Middlesex County (617) 864-8822
BELMONT MEDICAL ASSOCIATES, INC.
Podiatrist
725 CONCORD AVE, SUITE 4100
CAMBRIDGE, MA 02138
Middlesex County (617) 864-8822
DR. STEPHEN P. RANERE JR. M.D.
Internal Medicine
725 CONCORD AVE, SUITE 4100
CAMBRIDGE, MA 02138
Middlesex County (617) 864-8822
DR. KENNETH A. BERNSTEIN M.D.
Internal Medicine
725 CONCORD AVE, SUITE 4100
CAMBRIDGE, MA 02138
Middlesex County (617) 864-8822

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Maryn Kramerz's NPI number?

The NPI number for Maryn Kramerz is 1487396016. It was assigned to this individual provider in the NPPES registry on April 13, 2022.

Where is Maryn Kramerz located?

Maryn Kramerz practices at 725 Concord Ave, Cambridge, MA 02138. The listed phone number is (617) 661-4600.

What is Maryn Kramerz's specialty?

The primary specialty registered for this NPI is Nurse Practitioner, specializing in Family, with taxonomy code 363LF0000X.

Is Maryn Kramerz enrolled in Medicare?

Yes. Maryn Kramerz is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Maryn Kramerz's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Maryn Kramerz reassigns Medicare benefits to Reservoir Medical Associates, P.C. (Cambridge, MA). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Maryn Kramerz's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Maryn Kramerz was last updated on November 12, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.