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DR. MARY FREKKO KILAVOS M.D.
NPI 1609841188
Internal Medicine in Gaithersburg, MD

Active since February 20, 2006PECOS EnrolledAccepts Medicare Assignment
818 WEST DIAMOND AVENUE, STE 130, GAITHERSBURG, MD 20878(301) 948-8780(301) 519-9093 Get Directions Write a Review

NPPES record last updated: April 21, 2025. Verified against the NPPES registry weekly; last sync: November 01, 2026.

About Dr. Mary Frekko Kilavos M.d. NPPES

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

DR. MARY FREKKO KILAVOS M.D. (NPI 1609841188) is an individual internal medicine provider in Gaithersburg, Maryland, licensed in Maryland (D0062800) and active in the NPI registry since February 2006. She is enrolled in Medicare PECOS, is affiliated with Johns Hopkins Hospital, The, and maintains a secondary practice location in Rockville.

NPPES Registry Identity

NPI1609841188
Entity TypeIndividualFemale
Primary Taxonomy207R00000X
Provider Legal NameDR. MARY FREKKO KILAVOSCredential: M.D.
Location Address818 WEST DIAMOND AVENUE, STE 130Gaithersburg, MD 20878
Mailing Address818 West Diamond Avenue, Ste 130Gaithersburg, MD 20878 · (301) 948-8780 · Fax (301) 519-9093
Phone(301) 948-8780
Fax(301) 519-9093
Sole ProprietorNo
Medical School CMSGeorgetown University School Of MedicineGraduated 2002
Enumeration DateFebruary 20, 2006
Last NPPES UpdateApril 21, 2025
NPPES CertifiedApril 21, 2025
✔ NPI 1609841188 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
Licenses✔ Licensed in MD · D0062800✔ Licensed in DC · MD046987
Definition
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
818 WEST DIAMOND AVENUE, Gaithersburg, MD 20878
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Other Names 1

Former Name (1)Dr. Mary Ilona Frekko M.d.

Secondary Practice Location 1

Location 114955 Shady Grove Rd Ste 100Rockville, MD 20850-8728 · Phone (301) 990-3190 · Fax (410) 367-2021

Other Identifiers 1

Other492066MD · Medicare

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Mary Frekko Kilavos M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID8325069743
PECOS Enrollment IDI20051213000854, I20150318000523
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 Reassignments

3

Medicare enrollment records show Mary Kilavos reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Johns Hopkins Community Physicians, Inc
15 mi
Skilled Nursing Facility
7929 WESTPARK DR
Tysons, VA 22102
  • Reassigned Medicare billing, District of Columbia and Maryland enrollments
  • Also billed through NPI 1689485963 (Maryland)
  • 691 clinicians in this Medicare group
NPI 1790631695 (571) 617-0200
Privia Care Center LLC
19 mi
Internal Medicine
950 N GLEBE RD, SUITE 4000
Arlington, VA 22203
  • Reassigned Medicare billing, District of Columbia and Maryland enrollments
  • 242 clinicians in this Medicare group
NPI 1164874426 (571) 366-8850
Privia Medical Group, LLC
19 mi
Internal Medicine
950 N GLEBE RD STE 700
Arlington, VA 22203
  • Reassigned Medicare billing, District of Columbia and Maryland enrollments
  • 1,534 clinicians in this Medicare group
NPI 1013042480 (571) 366-8850

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 15

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 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.
603 services316 patients
Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit G0439
An annual wellness visit is a yearly appointment with your primary care provider to create or update a personalized prevention plan. This plan helps prevent illness based on your current health and risk factors. It's a subsequent visit, meaning it follows an initial assessment.
296 services296 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.
209 services148 patients
Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more 99215
This service involves a follow-up appointment for existing patients, lasting between 40 to 54 minutes. During this time, your healthcare provider will assess your current health status, discuss any changes or concerns, review your treatment plan, and answer any questions you may have.
123 services82 patients
Administration of influenza virus vaccine G0008
The administration of the influenza virus vaccine, also known as the flu shot, is a simple procedure to protect against the flu. A healthcare provider injects a small dose of the vaccine into your arm. This stimulates your immune system to produce antibodies, which will help your body fight off the flu if exposed.
75 services74 patients
Influenza vaccine split virus, preservative free 90662
The Influenza Vaccine Split Virus, preservative-free, is a flu shot to protect against the influenza virus. It is made from parts of inactivated flu viruses and doesn't contain preservatives, reducing potential side effects. It helps your body develop immunity to the flu.
73 services72 patients

Hospital Affiliations CMS Care Compare

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Johns Hopkins Hospital, The

Acute Care Hospitals · Baltimore, MD
4/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number210009
Location600 North Wolfe StreetBaltimore, MD 21287 · Baltimore City County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 20878 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
$147.85 typical visit price
range $65.18 – $194.86
Typical copayment $36.96 (range $16.29 – $48.71)
Most-billed visit code 99204
Established Patient
$113.72 typical visit price
range $21.40 – $158.88
Typical copayment $28.43 (range $5.35 – $39.72)
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.

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

Reported Quality Measures

e-Prescribing
At least one permissible prescription written by the MIPS eligible clinician is queried for a drug formulary and transmitted electronically using certified EHR technology.
98%4,584 patients4/55-star benchmark: 99%
Health Information Exchange
The MIPS eligible clinician that transitions or refers their patient to another setting of care or health care clinician (1) uses CEHRT to create a summary of care record; and (2) electronically transmits such summary to a receiving health care clinician for…
77%803 patients4/55-star benchmark: 88%
Medication Reconciliation
The MIPS eligible clinician performs medication reconciliation for at least one transition of care in which the patient is transitioned into the care of the MIPS eligible clinician.
99%144 patients4/55-star benchmark: 100%
Patient-Specific Education
The MIPS eligible clinician must use clinically relevant information from CEHRT to identify patient-specific educational resources and provide access to those materials to at least one unique patient seen by the MIPS eligible clinician.
93%1,910 patients4/55-star benchmark: 97%
Provide Patient Access
At least one patient seen by the MIPS eligible clinician during the performance period is provided timely access to view online, download, and transmit to a third party their health information subject to the MIPS eligible clinician's discretion to withhold…
98%1,910 patients4/55-star benchmark: 100%
Secure Messaging
For at least one unique patient seen by the MIPS eligible clinician during the performance period, a secure message was sent using the electronic messaging function of CEHRT to the patient (or the patient-authorized representative), or in response to a secure…
93%1,910 patients5/55-star benchmark: 89%
View, Download, or Transmit (VDT)
At least one patient seen by the MIPS eligible clinician during the performance period (or patient-authorized representative) views, downloads or transmits their health information to a third party during the performance period.
70%1,910 patients
Providers report different measures because they deliver different services; reporting more or less information is not a reflection of quality. Star ratings appear only where CMS assigned them.

Referred Medical Equipment & Supplies CMS DME claims 2

Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.

Blood glucose test or reagent strips for home blood glucose monitor, per 50 strips A4253
DME-Other DME · category DE017N
14 suppliers28 claims60 services$5.64 avg. paid by Medicare
Supply allowance for therapeutic continuous glucose monitor (cgm), includes all supplies and accessories, 1 month supply = 1 unit of service K0553
DME-Other DME · category DE017N
3 suppliers24 claims24 services$199.24 avg. paid by Medicare
Dollar amounts are the average Medicare paid the supplier per service. They are not the cost to the patient.

Other Providers at the Same Location NPPES 3

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

DR. KATHLEEN FREKKO FARRELL M.D.
Internal Medicine
818 WEST DIAMOND AVENUE, STE 130
GAITHERSBURG, MD 20878
Montgomery County (301) 948-8780
FREKKO PRIMARY CARE LLC
Family Medicine (Adult Medicine)
818 WEST DIAMOND AVENUE, STE 130
GAITHERSBURG, MD 20878
Montgomery County (301) 948-8780
DR. ANN FREKKO RAFFO MD
Internal Medicine
818 WEST DIAMOND AVENUE, STE 130
GAITHERSBURG, MD 20878
Montgomery County (301) 948-8780

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 Mary Kilavos's NPI number?

The NPI number for Mary Kilavos is 1609841188. It was assigned to this individual provider in the NPPES registry on February 20, 2006. The provider is also known as Dr. Mary Ilona Frekko M.D..

Where is Mary Kilavos located?

Mary Kilavos practices at 818 West Diamond Avenue Ste 130, Gaithersburg, MD 20878. The listed phone number is (301) 948-8780.

What is Mary Kilavos's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Is Mary Kilavos enrolled in Medicare?

Yes. Mary Kilavos is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organizations bill Medicare for Mary Kilavos's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Mary Kilavos reassigns Medicare benefits to 3 organizations: Johns Hopkins Community Physicians, Inc (Tysons, VA), Privia Care Center LLC (Arlington, VA) and Privia Medical Group, LLC (Arlington, VA). Each 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 Mary Kilavos's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

Is Mary Kilavos affiliated with any hospitals?

According to CMS data, Mary Kilavos is affiliated with Johns Hopkins Hospital, The.

When was this NPI record last updated?

The NPPES record for Mary Kilavos was last updated on April 21, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 18 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.