Active NPI 1285801407 Individual Practitioner Female Practitioner

Dr. Iryna G Chastain , MD

Internal Medicine • Worcester, MA

✓ Accepts Medicare Assignment

Professional Overview & Biography Verified Profile Summary

Dr. Iryna Chastain, MD is a certified Internal Medicine practicing in Worcester, MA. With approximately 29 years of clinical experience since completing medical education in 1997, Dr. Chastain delivers high-quality medical care to the local community at 123 SUMMER ST.

Dr. Chastain is affiliated with Reliant Medical Group Inc and accepts Medicare assignment.

Frequently performed procedures and clinical services include subsequent hospital care with moderate levelof medical decision making, if using time, at least, hospital discharge day management, more than, initial hospital care with moderate level of medical decision making, if using time, at least. Full Medicare procedure pricing transparency rates and service volume details are listed on this profile.

Practice Location & Contact Primary Location

Practice Address

123 Summer St

Worcester, MA 016081216

Telephone 5083635000

Associated Practice Facility / Clinic

🏢 Laboratory Corporation Of America Holdings Facility NPI 1093793200

Medicare Profile & Education

Medical School

Other

Graduation Year

1997

Medicare Assignment

✓ Accepts Assignment

Telehealth Flag

In-Person Only

Specialty Benchmarks & Practice Insights

Comparative analytics for Internal Medicine in Worcester, MA

Senior Veteran Specialist (>20 Yrs)

Practitioner Clinical Experience

29 Yrs +9.6 yrs vs City Avg

City Avg: 19.4 Yrs

State Avg: 29.3 Yrs

Regional Practice Density

460 Specialists

Practicing in Worcester, MA (7127 Statewide)

Telehealth Adoption Rate

15.9% Regional Adoption

In-Person Office Visits Only

Medicare Pricing Discount

62.3% Avg Savings

Under CMS Medicare Fee Schedule vs Standard Submitted Charges

Clinical Seniority & Experience Comparison

Dr. Chastain (29 Years) 29 Yrs

Worcester Specialty Average (19.4 Years) 19.4 Yrs

Performed Procedures & Service Volume

Top Medicare Part B procedures performed by this practitioner

CMS Official Data (2024)

Reporting Year:

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99233 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes	389	113	$268.00	$116.81
99239 Hospital discharge day management, more than 30 minutes	99	87	$276.00	$113.53
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	44	44	$521.00	$171.23

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99233 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes	271	95	$268.00	$119.58
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	112	45	$187.00	$79.76
99239 Hospital discharge day management, more than 30 minutes	90	79	$276.00	$115.77
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	29	29	$521.00	$174.83
99238 Hospital discharge day management, 30 minutes or less	17	15	$187.00	$81.70
99222 Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes	12	12	$354.00	$131.09

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99233 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes	331	98	$268.00	$104.03
99226 Subsequent observation care, typically 35 minutes per day	78	56	$270.00	$102.88
99239 Hospital discharge day management, more than 30 minutes	73	68	$276.00	$107.26
99220 Hospital observation care, typically 70 minutes	49	49	$475.00	$181.38
99217 Hospital observation care on day of discharge	37	36	$188.00	$72.94
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	20	18	$521.00	$201.32

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99233 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes	209	81	$268.00	$106.07
99226 Subsequent observation care, typically 35 minutes per day	73	46	$270.00	$106.07
99239 Hospital discharge day management, more than 30 minutes	57	56	$276.00	$109.60
99217 Hospital observation care on day of discharge	33	33	$188.00	$74.38
99220 Hospital observation care, typically 70 minutes	32	32	$475.00	$186.62
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	17	17	$521.00	$205.65

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99233 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes	262	87	$268.00	$108.65
99239 Hospital discharge day management, more than 30 minutes	73	61	$276.00	$110.91
99226 Subsequent observation care, typically 35 minutes per day	56	43	$270.00	$109.32
99220 Hospital observation care, typically 70 minutes	42	40	$475.00	$189.07
99217 Hospital observation care on day of discharge	42	39	$188.00	$76.11
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	22	22	$521.00	$211.18

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99233 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes	363	114	$268.00	$107.50
99239 Hospital discharge day management, more than 30 minutes	98	86	$276.00	$111.08
99226 Subsequent observation care, typically 35 minutes per day	56	40	$270.00	$108.26
99220 Hospital observation care, typically 70 minutes	37	37	$475.00	$191.91
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	33	31	$521.00	$209.19
99217 Hospital observation care on day of discharge	30	29	$188.00	$75.80

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99233 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes	380	128	$255.00	$108.14
99239 Hospital discharge day management, more than 30 minutes	85	80	$263.00	$112.09
99220 Hospital observation care, typically 70 minutes	64	61	$452.00	$193.26
99226 Subsequent observation care, typically 35 minutes per day	59	43	$257.00	$108.90
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	51	50	$496.00	$210.57
99217 Hospital observation care on day of discharge	43	42	$179.00	$76.12
99238 Hospital discharge day management, 30 minutes or less	14	14	$178.00	$76.09

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99233 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes	327	118	$255.00	$106.09
99239 Hospital discharge day management, more than 30 minutes	94	81	$263.00	$109.00
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	56	53	$503.50	$207.18
99217 Hospital observation care on day of discharge	48	46	$179.00	$74.72
99226 Subsequent observation care, typically 35 minutes per day	44	33	$257.00	$107.47
99220 Hospital observation care, typically 70 minutes	30	30	$452.00	$189.88

Medical Specialties & State Licenses

CMS Verified: 2020-03-09

Internal Medicine Primary Specialty

NUCC Taxonomy Code: 207R00000X

State License MA 238742

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.

Additional State Medicaid & Healthcare Payer Identifiers

Medicaid State Provider ID

110083584A (MA)

Hospital & Practice Group Affiliations

Reliant Medical Group Inc

5 Neponset St, Worcesteer, MA 016062714

Phone: 5085952300

Reliant Medical Group Inc

123 Summer St, Worcester, MA 016081216

Phone: 5083635000

Practice Associates & Co-Workers

Healthcare professionals and specialists practicing at this location or sharing practice phone/fax

40 Associated Practitioners

Dr. Yeshaswini Katkoori , MD

Student in an Organized Health Care Education/Training Program

NPI 1003619149

Doctor of Medicine (M.D.)

Danielle Peloquin

Nurse Anesthetist, Certified Registered

NPI 1003687195

Keith Beals , PA

Physician Assistant

NPI 1003989039

Physician Assistant

Dr. Tarun Jayathilagar , MD

Student in an Organized Health Care Education/Training Program

NPI 1013852706

Doctor of Medicine (M.D.)

Dr. Khushi Goyal , MD

Student in an Organized Health Care Education/Training Program

NPI 1013853258

Doctor of Medicine (M.D.)

Anne Covino , CNM

Midwife

NPI 1013977602

Certified Nurse Midwife

Career & Practice History Timeline

Chronological log of verified NPI updates, location relocations, credentials, and registry changes

12 Historical Events

📍

Updated Business Mailing Address March 09, 2020

Registered at 5 NEPONSET STREET, WOT 2ND FL, STE C203, WORCESTER, MA 016062714 (Tel: 5088520600)

✅

NPI Profile Active May 10, 2017

NPI status registered as active in NPPES database

📍

Updated Practice Location May 10, 2017

Registered at 123 SUMMER ST, WORCESTER, MA 016081216 (Tel: 5083635000)

📍

Updated Business Mailing Address May 10, 2017

Registered at PO BOX 3552, WORCESTER, MA 016133552 (Tel: 5082466436)

👤

Provider Name / Credentials Updated May 10, 2017

Recorded as IRYNA CHASTAIN, M.D.

🎓

Medical Taxonomy / Specialty Registered (Primary Specialty) May 10, 2017

Internal Medicine (License #238742 in MA)

✅

NPI Profile Active May 15, 2008

NPI status registered as active in NPPES database

📍

Updated Practice Location May 15, 2008

Registered at 123 SUMMER ST, WORCESTER, MA 016081216 (Tel: 5083635000)

📍

Updated Business Mailing Address May 15, 2008

Registered at PO BOX 3552, WORCESTER, MA 016133552 (Tel: 5082466436)

👤

Provider Name / Credentials Updated May 15, 2008

Recorded as IRYNA CHASTAIN, M.D.

🎓

Medical Taxonomy / Specialty Registered (Primary Specialty) May 15, 2008

Internal Medicine (License #228712 in MA)

🟢

Initial NPI Registration & Enumeration May 15, 2008

First registered as active Individual Practitioner in NPPES Database.

Patient & Community Reviews

Verified patient ratings, medical care experiences, and facility photos

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NPI Administrative Meta

NPI Number: 1285801407

Entity Type:

Individual Provider Physician, Nurse Practitioner, or Solo Healthcare Professional (Type 1 NPI)

Enumeration Date: May 15, 2008

Last Update: March 09, 2020

Sole Proprietor: No

Update or Correct Profile

Mailing Address

5 Neponset Street, Wot 2nd Fl, Ste C203

Worcester, MA 016062714

Phone: 5088520600

Public Domain Record This profile contains public domain information published by CMS and NPPES under the Freedom of Information Act (FOIA).

⚠️ Medical Disclaimer

This directory listing is for informational purposes only and does not constitute medical advice, diagnosis, or physician endorsement. If you are experiencing a medical emergency, please call 911 immediately.