Doctor profile · Federal record
Dr. Iryna Chastain, M.D.
Internal Medicine Physician (CMS: Internal Medicine) · Worcester, MA
- NPI 1285801407
- Accepts Medicare
- 29 yrs in practice
- Female
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
123 Summer St
Worcester, MA 016081216
(508) 363-5000 - Mailing address
-
5 Neponset Street, Wot 2Nd Fl, Ste C203
Worcester, MA 016062714
Credentials & registration
- NPI registered
- May 2008 — 18 yrs on file
- Profile last updated
- March 9, 2020
- Year of graduation
- 1997 — 29 yrs since
- Specialty taxonomy
- 207R00000X — NUCC code
- State license (1)
- Massachusetts #238742
- Medicaid
- MA #110083584A
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1285801407. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
531
Distinct HCPCS
6
Medicare allowed
$59,790
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99233 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | 271 | 95 | $120 | |
99232 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 112 | 45 | $80 | |
99239 |
Hospital discharge day management, more than 30 minutes | 90 | 79 | $116 | |
99223 |
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | 29 | 29 | $175 | |
99238 |
Hospital discharge day management, 30 minutes or less | 17 | 15 | $82 | |
99222 |
Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes | 12 | 12 | $131 |
In context: peer comparison
Among 114 peers in Worcester Internal Medicine Physician, average services per provider: 102. This provider delivers 5.2× the peer median.Medicare Part D · 2023
Top prescriptions
Total claims
113
Patients
70
Total drug cost
$8,267
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Pantoprazole Sodium | Generic | 24 | 0 | $765 |
| Cefpodoxime Proxetil | Generic | 21 | 20 | $773 |
| Prednisone | Generic | 19 | 15 | $131 |
| Metoprolol Succinate | Generic | 13 | 12 | $215 |
| Omeprazole | Generic | 13 | 11 | $117 |
| Furosemide | Generic | 12 | 12 | $47 |
| Eliquis (Apixaban) | Brand | 11 | 0 | $6,219 |
Frequently asked questions
What is Dr. Iryna Chastain's medical specialty?
Dr. Iryna Chastain practices Internal Medicine Physician in Worcester, MA.
Where does Dr. Iryna Chastain practice?
Dr. Iryna Chastain practices at 123 Summer St, Worcester, MA 016081216. Office phone: 5083635000.
What is Dr. Iryna Chastain's NPI?
Dr. Iryna Chastain's National Provider Identifier (NPI) is 1285801407, issued by NPPES.
Does Dr. Iryna Chastain accept Medicare assignment?
Yes. Dr. Iryna Chastain accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Iryna Chastain commonly perform?
Top Medicare-reported procedures in 2023: Subsequent hospital care with moderate levelof medical decision making (HCPCS 99233); Subsequent hospital care with moderate levelof medical decision making (HCPCS 99232); Hospital discharge day management (HCPCS 99239). Source: CMS Medicare Physician & Other Practitioners file.