Doctor profile · Federal record
Dr. Gregory Shirk, DC
Chiropractor (CMS: Chiropractic) · Mason City, IA
- NPI 1629064464
- Accepts Medicare
- 31 yrs in practice
- Male
- Solo practice
- No sanctions
Practice & contact
- Primary practice
-
630 1St St Nw
Mason City, IA 504012947
(641) 423-4455
fax (641) 423-0354
Credentials & registration
- NPI registered
- September 2005 — 21 yrs on file
- Profile last updated
- November 19, 2014
- Year of graduation
- 1995 — 31 yrs since
- Specialty taxonomy
- 111N00000X — NUCC code
- State license (1)
- Iowa #A05882
- Medicaid
- IA #0121657
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1629064464. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
1,859
Distinct HCPCS
2
Medicare allowed
$69,336
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
98941 |
Chiropractic manipulative treatment, 3-4 spinal regions | 1,769 | 168 | $38 | |
98940 |
Chiropractic manipulative treatment, 1-2 spinal regions | 90 | 38 | $26 |
In context: peer comparison
Among 5 peers in this city , average services per provider: 833. This provider delivers 2.2× the peer median.Frequently asked questions
What is Dr. Gregory Shirk's medical specialty?
Dr. Gregory Shirk practices Chiropractor in Mason City, IA.
Where does Dr. Gregory Shirk practice?
Dr. Gregory Shirk practices at 630 1St St Nw, Mason City, IA 504012947. Office phone: 6414234455.
What is Dr. Gregory Shirk's NPI?
Dr. Gregory Shirk's National Provider Identifier (NPI) is 1629064464, issued by NPPES.
Does Dr. Gregory Shirk accept Medicare assignment?
Yes. Dr. Gregory Shirk accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Gregory Shirk commonly perform?
Top Medicare-reported procedures in 2023: Chiropractic manipulative treatment, 3-4 spinal regions (HCPCS 98941); Chiropractic manipulative treatment, 1-2 spinal regions (HCPCS 98940). Source: CMS Medicare Physician & Other Practitioners file.