ICD-10 · PDGM grouping
M79 Other and unspecified soft tissue disorders, not elsewhere classified
All 52 codes in the M79 family, with the PDGM clinical group, comorbidity subgroup and primary-position rule CMS assigns, read from the CMS grouper crosswalk v07.2.26 and the CDC FY2027 code file.
ICD-10-CM FY2027 · CMS grouper v07.2.26
Codes in family
52
Can lead a claim
18
Cannot lead a claim
34
What CMS assigns to M79
18 of the 52 codes group to Musculoskeletal Rehabilitation; 34 are assigned no clinical group. None of the 52 is assigned a comorbidity subgroup. 18 of the 52 can lead a claim. CMS attaches a code-first note to 8 of the 52.
Code first
CMS grouper convention 12, on M79.A11, M79.A12, M79.A19, M79.A21, M79.A22, M79.A29, M79.A3, M79.A9. Code first:
- underlying disease
Every code in M79
Descriptions are CDC’s FY2027 wording; where CMS’s grouper abbreviates one, its form is shown beneath.
| Code | Description | Primary position | Clinical group | Comorbidity subgroup |
|---|---|---|---|---|
| M79.0 | Rheumatism, unspecified | Can lead a claim | E | None |
| M79.1 Myalgia | ||||
| M79.10 | Myalgia, unspecified site | Can lead a claim | E | None |
| M79.11 | Myalgia of mastication muscle | Can lead a claim | E | None |
| M79.12 | Myalgia of auxiliary muscles, head and neck | Can lead a claim | E | None |
| M79.18 | Myalgia, other site | Can lead a claim | E | None |
| M79.2 | Neuralgia and neuritis, unspecified | Can lead a claim | E | None |
| M79.3 | Panniculitis, unspecified | Can lead a claim | E | None |
| M79.4 | Hypertrophy of (infrapatellar) fat pad | Can lead a claim | E | None |
| M79.5 | Residual foreign body in soft tissue | Can lead a claim | E | None |
| M79.6 Pain in limb, hand, foot, fingers and toes | ||||
| M79.60 Pain in limb, unspecified | ||||
| M79.601 | Pain in right arm | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M79.602 | Pain in left arm | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M79.603 | Pain in arm, unspecified | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M79.604 | Pain in right leg | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M79.605 | Pain in left leg | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M79.606 | Pain in leg, unspecified | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M79.609 | Pain in unspecified limb | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M79.62 Pain in upper arm | ||||
| M79.621 | Pain in right upper arm | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M79.622 | Pain in left upper arm | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M79.629 | Pain in unspecified upper arm | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M79.63 Pain in forearm | ||||
| M79.631 | Pain in right forearm | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M79.632 | Pain in left forearm | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M79.639 | Pain in unspecified forearm | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M79.64 Pain in hand and fingers | ||||
| M79.641 | Pain in right hand | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M79.642 | Pain in left hand | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M79.643 | Pain in unspecified hand | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M79.644 | Pain in right finger(s) | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M79.645 | Pain in left finger(s) | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M79.646 | Pain in unspecified finger(s) | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M79.65 Pain in thigh | ||||
| M79.651 | Pain in right thigh | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M79.652 | Pain in left thigh | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M79.659 | Pain in unspecified thigh | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M79.66 Pain in lower leg | ||||
| M79.661 | Pain in right lower leg | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M79.662 | Pain in left lower leg | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M79.669 | Pain in unspecified lower leg | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M79.67 Pain in foot and toes | ||||
| M79.671 | Pain in right foot | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M79.672 | Pain in left foot | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M79.673 | Pain in unspecified foot | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M79.674 | Pain in right toe(s) | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M79.675 | Pain in left toe(s) | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M79.676 | Pain in unspecified toe(s) | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M79.7 | Fibromyalgia | Can lead a claim | E | None |
| M79.A Nontraumatic compartment syndrome | ||||
| M79.A1 Nontraumatic compartment syndrome of upper extremity | ||||
| M79.A11 | Nontraumatic compartment syndrome of right upper extremity | Can lead a claim, code first applies | E | None |
| M79.A12 | Nontraumatic compartment syndrome of left upper extremity | Can lead a claim, code first applies | E | None |
| M79.A19 | Nontraumatic compartment syndrome of unspecified upper extremityCMS: Nontraumatic compartment syndrome of unsp upper extremity | Cannot lead a claimUnspecified diagnosis code not acceptable as principal diagnosis since there is a more specific code available that would further accurately identify the condition | None | None |
| M79.A2 Nontraumatic compartment syndrome of lower extremity | ||||
| M79.A21 | Nontraumatic compartment syndrome of right lower extremity | Can lead a claim, code first applies | E | None |
| M79.A22 | Nontraumatic compartment syndrome of left lower extremity | Can lead a claim, code first applies | E | None |
| M79.A29 | Nontraumatic compartment syndrome of unspecified lower extremityCMS: Nontraumatic compartment syndrome of unsp lower extremity | Cannot lead a claimUnspecified diagnosis code not acceptable as principal diagnosis since there is a more specific code available that would further accurately identify the condition | None | None |
| M79.A3 | Nontraumatic compartment syndrome of abdomen | Can lead a claim, code first applies | E | None |
| M79.A9 | Nontraumatic compartment syndrome of other sites | Can lead a claim, code first applies | E | None |
| M79.8 Other specified soft tissue disorders | ||||
| M79.81 | Nontraumatic hematoma of soft tissue | Can lead a claim | E | None |
| M79.89 | Other specified soft tissue disorders | Can lead a claim | E | None |
| M79.9 | Soft tissue disorder, unspecified | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
Sources: CMS HH PPS Grouper Software v07.2.26, effective 2026-10-01, for the clinical group, comorbidity subgroup, code-first conventions and primary-position flags; CDC NCHS ICD-10-CM FY2027 code descriptions for the family title and code wording. This is the crosswalk Medicare runs a claim through. Grouping also depends on admission source, timing, the OASIS functional items and the rest of the diagnosis list.
The monthly home health regs digest
What CMS changed, what's due next, and what to do about it — one email a month, no fluff. Read the first issue