HCPCS Level II modifier
Modifier CM
Modifier CM is a HCPCS Level II modifier. CMS describes it as: At least 80 percent but less than 100 percent impaired, limited or restricted.
Source: CMS HCPCS Level II, October 2026 file dated September 23, 2026. Publisher page
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- Modifier
- CM
- Type
- HCPCS Level II modifier, maintained by CMS
- CMS description
- At least 80 percent but less than 100 percent impaired, limited or restricted
- Claim form
- CMS-1500 item 24D, up to four modifiers per line. 837P SV101-3 to SV101-6.
- Guidance
- CMS HCPCS quarterly update
Related modifiers
- CN100 percent impaired, limited or restricted
- CLAt least 60 percent but less than 80 percent impaired, limited or restricted
- COOutpatient occupational therapy services furnished in whole or in part by an occupational therapy assistant
- CKAt least 40 percent but less than 60 percent impaired, limited or restricted
- CPAdjunctive service related to a procedure assigned to a comprehensive ambulatory payment classification (c-apc) procedure, but reported on a different claim
- CJAt least 20 percent but less than 40 percent impaired, limited or restricted
- CQOutpatient physical therapy services furnished in whole or in part by a physical therapist assistant
- CIAt least 1 percent but less than 20 percent impaired, limited or restricted
Related pages
Questions
What does modifier CM mean?
Modifier CM is a HCPCS Level II modifier. CMS describes it as: At least 80 percent but less than 100 percent impaired, limited or restricted.
Is modifier CM a CPT or a HCPCS modifier?
CM is a HCPCS Level II modifier from the CMS quarterly HCPCS file. Two-digit numeric modifiers, such as 25 or 59, are CPT modifiers.
Where does modifier CM go on a claim?
On the CMS-1500 it goes in item 24D next to the procedure code. Each line holds up to four modifiers. On an 837P it goes in SV101-3 to SV101-6.
What denial comes back when a modifier is wrong?
A missing or mismatched modifier often comes back as CARC 4. A modifier that was not valid on the date of service comes back as CARC 182. A bundling edit the modifier should have bypassed comes back as CARC 97 or 236.