1. Home
  2. Directory
  3. Massachusetts
  4. Worcester
  5. Internal Medicine
  6. NPI Profile

MRS. IRYNA G CHASTAIN M.D.
NPI 1285801407
Internal Medicine in Worcester, MA

Active since May 15, 2008PECOS EnrolledAccepts Medicare Assignment
123 SUMMER ST, WORCESTER, MA 01608(508) 363-5000 Get Directions Write a Review

NPPES record last updated: March 9, 2020. Verified against the NPPES registry weekly; last sync: August 09, 2026.

Record update history: Mar 9, 2020, May 10, 2017 (2 updates tracked since 2017).

About Mrs. Iryna G Chastain M.d. NPPES

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

MRS. IRYNA G CHASTAIN M.D. (NPI 1285801407) is an individual internal medicine provider in Worcester, Massachusetts, licensed in Massachusetts (238742) and active in the NPI registry since May 2008. She is enrolled in Medicare PECOS, is affiliated with Umass Memorial Healthalliance Hospitals, and is a graduate of Other (1997).

NPPES Registry Identity

NPI1285801407
Entity TypeIndividualFemale
Primary Taxonomy207R00000X
Provider Legal NameMRS. IRYNA G CHASTAINCredential: M.D.
Location Address123 SUMMER STWorcester, MA 01608-1216
Mailing Address5 Neponset Street, Wot 2nd Fl, Ste C203Worcester, MA 01606-2714 · (508) 852-0600 · Fax (508) 368-3146
Phone(508) 363-5000
Sole ProprietorNo
Medical School CMSOtherGraduated 1997
Enumeration DateMay 15, 2008
Last NPPES UpdateMarch 9, 20202 updates tracked since enumeration
NPPES CertifiedMarch 9, 2020
✔ NPI 1285801407 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License✔ Licensed in MA · 238742
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.
123 SUMMER ST, Worcester, MA 01608
Open in Google Maps ↗

Other Names 1

Other Name (5)Mrs. Iryna Gennagyevna Chastain M.d.

Other Identifiers 1

Medicaid110083584AMA

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

Mrs. Iryna G Chastain 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 ID7618028606
PECOS Enrollment IDI20090702000539
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 3

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 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.
389 services113 patients
Hospital discharge day management, more than 30 minutes 99239
Hospital discharge day management over 30 minutes involves a detailed process to ensure a smooth transition from hospital to home. It includes final examinations, discussion of your hospital stay, post-discharge instructions, and coordinating follow-up care.
99 services87 patients
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes 99223
Initial hospital inpatient care per day, typically 70 minutes, refers to the daily medical service provided to patients admitted to the hospital. This includes a comprehensive evaluation, diagnosis, treatment plan, and monitoring of your health condition. It ensures your well-being during your hospital stay.
44 services44 patients

Hospital Affiliations CMS Care Compare 2

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

Umass Memorial Healthalliance Hospitals

Acute Care Hospitals · Leominster, MA
2/5 CMS rating
OwnershipVoluntary non-profit - Other
CMS Certification Number220001
Location60 Hospital RoadLeominster, MA 01453 · Worcester County
Emergency services

St Vincent Hospital

Acute Care Hospitals · Worcester, MA
2/5 CMS rating
OwnershipProprietary
CMS Certification Number220176
Location123 Summer StreetWorcester, MA 01608 · Worcester County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 01608 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
$134.47 typical visit price
range $58.86 – $177.36
Typical copayment $33.61 (range $14.71 – $44.34)
Most-billed visit code 99204
Established Patient
$103.48 typical visit price
range $19.11 – $144.84
Typical copayment $25.87 (range $4.77 – $36.21)
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.

Referred Medical Equipment & Supplies CMS DME claims

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

Oxygen concentrator, single delivery port, capable of delivering 85 percent or greater oxygen concentration at the prescribed flow rate E1390
DME-Oxygen and Supplies · category DC002N
2 suppliers11 claims11 services$67.84 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 20

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

MADAIAH LOKESHWARI M.D.
Hospitalist
123 SUMMER ST
WORCESTER, MA 01608
Worcester County (508) 363-6849
DR. JENNIFER LYNNE PAPPALARDO DPM
Podiatrist (Foot & Ankle Surgery)
123 SUMMER ST, DEPARTMENT OF PODIATRY
WORCESTER, MA 01608
Worcester County (508) 363-7390
DR. MADHAV SHARMA MD
Internal Medicine
123 SUMMER ST
WORCESTER, MA 01608
Worcester County (508) 363-5438
YESHASWINI KATKOORI MD
Student in an Organized Health Care Education/Training Program
123 SUMMER ST
WORCESTER, MA 01608
Worcester County (508) 363-5000
DANIELLE MAY PELOQUIN
Nurse Anesthetist, Certified Registered
123 SUMMER ST
WORCESTER, MA 01608
Worcester County (508) 363-5000
DR. YAYAN CHEN M.D.
Pathology (Anatomic Pathology & Clinical Pathology)
123 SUMMER ST
WORCESTER, MA 01608
Worcester County (508) 363-6049
FARRICY & KRAFT LLP
Obstetrics & Gynecology (Obstetrics)
123 SUMMER ST, SUITE 560
WORCESTER, MA 01608
Worcester County (508) 363-6100
KEITH A BEALS PA
Physician Assistant
123 SUMMER ST
WORCESTER, MA 01608
Worcester County (508) 363-5000

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 Iryna Chastain's NPI number?

The NPI number for Iryna Chastain is 1285801407. It was assigned to this individual provider in the NPPES registry on May 15, 2008. The provider is also known as Mrs. Iryna Gennagyevna Chastain M.D..

Where is Iryna Chastain located?

Iryna Chastain practices at 123 Summer St, Worcester, MA 01608. The listed phone number is (508) 363-5000.

What is Iryna Chastain's specialty?

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

Is Iryna Chastain enrolled in Medicare?

Yes. Iryna Chastain 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 Iryna Chastain affiliated with any hospitals?

According to CMS data, Iryna Chastain is affiliated with Umass Memorial Healthalliance Hospitals and St Vincent Hospital.

When was this NPI record last updated?

The NPPES record for Iryna Chastain was last updated on March 9, 2020. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 years 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.