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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

OLGA VASYLYEVA M.D.
NPI 1235455072
Internal Medicine - Infectious Disease in Greenwich, CT

Active since April 19, 2010PECOS EnrolledAccepts Medicare Assignment
95.19/100
CMS Quality Rating
5 PERRYRIDGE RD, GREENWICH, CT 06830(203) 869-8838 Get Directions Write a Review

NPPES record last updated: June 25, 2026. Verified against the NPPES registry weekly; last sync: August 16, 2026.

Record update history: May 14, 2021, Dec 11, 2017 (2 updates tracked since 2017).

About Olga Vasylyeva M.d. NPPES

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

OLGA VASYLYEVA M.D. (NPI 1235455072) is an individual infectious disease provider in Greenwich, Connecticut, licensed in New York (271226) and active in the NPI registry since April 2010. She is enrolled in Medicare PECOS, is affiliated with Rochester General Hospital, and is a graduate of Other (2002).

NPPES Registry Identity

NPI1235455072
Entity TypeIndividualFemale
Primary Taxonomy207RI0200X
Provider Legal NameOLGA VASYLYEVACredential: M.D.
Location Address5 PERRYRIDGE RDGreenwich, CT 06830-4608
Mailing Address5 Perryridge RdGreenwich, CT 06830-4608 · (203) 869-8838
Phone(203) 869-8838
Sole ProprietorNo
Medical School CMSOtherGraduated 2002
Enumeration DateApril 19, 2010
Last NPPES UpdateJune 25, 20262 updates tracked since enumeration
NPPES CertifiedJune 25, 2026
✔ NPI 1235455072 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · Infectious DiseaseAllopathic & Osteopathic Physicians
Taxonomy Code207RI0200X
Licenses✔ Licensed in NY · 271226✔ Licensed in CT · 84050
Definition
An internist who deals with infectious diseases of all types and in all organ systems. Conditions requiring selective use of antibiotics call for this special skill. This physician often diagnoses and treats AIDS patients and patients with fevers which have not been explained. Infectious disease specialists may also have expertise in preventive medicine and travel medicine.
5 PERRYRIDGE RD, Greenwich, CT 06830
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Other Identifiers 1

Medicaid04164274NY

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Olga Vasylyeva 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 ID9335453059
PECOS Enrollment IDI20150807014688
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.

Areas of Expertise CMS Part B claims 4

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.

Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes 99232
Follow-up hospital inpatient care involves daily check-ups while you're admitted in the hospital. Typically, a healthcare provider spends about 25 minutes each day reviewing your condition, adjusting treatment if needed, and answering any questions you might have.
56 services30 patients
Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes 99222
Initial hospital inpatient care is a service where a healthcare provider spends about 50 minutes per day overseeing your care while you're admitted in the hospital. This includes reviewing your health status, planning your treatment, and ensuring your safety and comfort.
23 services21 patients
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes 99233
Follow-up hospital inpatient care per day typically involves a 35-minute check-up by your healthcare provider. This service includes monitoring your health progress, adjusting your treatment plan if needed, and answering any questions you may have about your condition or care.
20 services16 patients
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.
18 services13 patients

Hospital Affiliations CMS Care Compare

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

Rochester General Hospital

Acute Care Hospitals · Rochester, NY
2/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number330125
Location1425 Portland AvenueRochester, NY 14621 · Monroe County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 06830 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
$138.84 typical visit price
range $60.82 – $183.10
Typical copayment $34.71 (range $15.20 – $45.77)
Most-billed visit code 99204
Established Patient
$106.68 typical visit price
range $19.76 – $149.26
Typical copayment $26.67 (range $4.94 – $37.31)
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.

95.19/100
MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program
Scored through an Alternative Payment Model
Quality70.62
Promoting Interoperability100
Improvement Activities40

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.

ZARA NADIA ILAHI MD
Pediatrics (Neonatal-Perinatal Medicine)
5 PERRYRIDGE RD
GREENWICH, CT 06830
Western Connecticut Planning Region (203) 863-3000
SARAH STAMPER M.D.
Student in an Organized Health Care Education/Training Program
5 PERRYRIDGE RD, MEDICAL EDUCATION
GREENWICH, CT 06830
Western Connecticut Planning Region (203) 863-3409
JUNE EVELYN JEON MD
Student in an Organized Health Care Education/Training Program
5 PERRYRIDGE RD
GREENWICH, CT 06830
Western Connecticut Planning Region (203) 863-3000
ARIANA DOMINICUS PA-C
Physician Assistant
5 PERRYRIDGE RD
GREENWICH, CT 06830
Western Connecticut Planning Region (203) 863-3000
ERIC LI-MING HUANG BSC, PHARMD
Pharmacist (Pharmacotherapy)
5 PERRYRIDGE RD
GREENWICH, CT 06830
Western Connecticut Planning Region (203) 863-3199
ROSEMARY PERLEY-KWAUK CRNA
Nurse Anesthetist, Certified Registered
5 PERRYRIDGE RD
GREENWICH, CT 06830
Western Connecticut Planning Region (203) 661-5330
DR. FRANCISCO J BREA MD
Anesthesiology
5 PERRYRIDGE RD
GREENWICH, CT 06830
Western Connecticut Planning Region (203) 661-5330
ANNE YAN TING CHUA MBBS
Student in an Organized Health Care Education/Training Program
5 PERRYRIDGE RD
GREENWICH, CT 06830
Western Connecticut Planning Region (203) 863-3409

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 Olga Vasylyeva's NPI number?

The NPI number for Olga Vasylyeva is 1235455072. It was assigned to this individual provider in the NPPES registry on April 19, 2010.

Where is Olga Vasylyeva located?

Olga Vasylyeva practices at 5 Perryridge Rd, Greenwich, CT 06830. The listed phone number is (203) 869-8838.

What is Olga Vasylyeva's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Infectious Disease, with taxonomy code 207RI0200X.

Is Olga Vasylyeva enrolled in Medicare?

Yes. Olga Vasylyeva 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.

Is Olga Vasylyeva affiliated with any hospitals?

According to CMS data, Olga Vasylyeva is affiliated with Rochester General Hospital.

When was this NPI record last updated?

The NPPES record for Olga Vasylyeva was last updated on June 25, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 58 days 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.