ICD-10 · PDGM grouping
M23 Internal derangement of knee
All 111 codes in the M23 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
111
Can lead a claim
72
Cannot lead a claim
39
What CMS assigns to M23
72 of the 111 codes group to Musculoskeletal Rehabilitation; 39 are assigned no clinical group. None of the 111 is assigned a comorbidity subgroup. 72 of the 111 can lead a claim.
Every code in M23
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 |
|---|---|---|---|---|
| M23.0 Cystic meniscus | ||||
| M23.00 Cystic meniscus, unspecified meniscus | ||||
| M23.000 | Cystic meniscus, unspecified lateral meniscus, right knee | Can lead a claim | E | None |
| M23.001 | Cystic meniscus, unspecified lateral meniscus, left knee | Can lead a claim | E | None |
| M23.002 | Cystic meniscus, unspecified lateral meniscus, unspecified kneeCMS: Cystic meniscus, unsp lateral meniscus, unspecified knee | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M23.003 | Cystic meniscus, unspecified medial meniscus, right knee | Can lead a claim | E | None |
| M23.004 | Cystic meniscus, unspecified medial meniscus, left knee | Can lead a claim | E | None |
| M23.005 | Cystic meniscus, unspecified medial meniscus, unspecified kneeCMS: Cystic meniscus, unsp medial meniscus, unspecified knee | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M23.006 | Cystic meniscus, unspecified meniscus, right knee | Can lead a claim | E | None |
| M23.007 | Cystic meniscus, unspecified meniscus, left knee | Can lead a claim | E | None |
| M23.009 | Cystic meniscus, unspecified meniscus, unspecified knee | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M23.01 Cystic meniscus, anterior horn of medial meniscus | ||||
| M23.011 | Cystic meniscus, anterior horn of medial meniscus, right kneeCMS: Cystic meniscus, anterior horn of medial meniscus, r knee | Can lead a claim | E | None |
| M23.012 | Cystic meniscus, anterior horn of medial meniscus, left knee | Can lead a claim | E | None |
| M23.019 | Cystic meniscus, anterior horn of medial meniscus, unspecified kneeCMS: Cystic meniscus, anterior horn of medial meniscus, unsp knee | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M23.02 Cystic meniscus, posterior horn of medial meniscus | ||||
| M23.021 | Cystic meniscus, posterior horn of medial meniscus, right kneeCMS: Cystic meniscus, posterior horn of medial meniscus, r knee | Can lead a claim | E | None |
| M23.022 | Cystic meniscus, posterior horn of medial meniscus, left kneeCMS: Cystic meniscus, posterior horn of medial meniscus, l knee | Can lead a claim | E | None |
| M23.029 | Cystic meniscus, posterior horn of medial meniscus, unspecified kneeCMS: Cystic meniscus, post horn of medial meniscus, unsp knee | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M23.03 Cystic meniscus, other medial meniscus | ||||
| M23.031 | Cystic meniscus, other medial meniscus, right knee | Can lead a claim | E | None |
| M23.032 | Cystic meniscus, other medial meniscus, left knee | Can lead a claim | E | None |
| M23.039 | Cystic meniscus, other medial meniscus, unspecified knee | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M23.04 Cystic meniscus, anterior horn of lateral meniscus | ||||
| M23.041 | Cystic meniscus, anterior horn of lateral meniscus, right kneeCMS: Cystic meniscus, anterior horn of lat mensc, right knee | Can lead a claim | E | None |
| M23.042 | Cystic meniscus, anterior horn of lateral meniscus, left kneeCMS: Cystic meniscus, anterior horn of lat mensc, left knee | Can lead a claim | E | None |
| M23.049 | Cystic meniscus, anterior horn of lateral meniscus, unspecified kneeCMS: Cystic meniscus, anterior horn of lat mensc, unsp knee | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M23.05 Cystic meniscus, posterior horn of lateral meniscus | ||||
| M23.051 | Cystic meniscus, posterior horn of lateral meniscus, right kneeCMS: Cystic meniscus, posterior horn of lat mensc, right knee | Can lead a claim | E | None |
| M23.052 | Cystic meniscus, posterior horn of lateral meniscus, left kneeCMS: Cystic meniscus, posterior horn of lat mensc, left knee | Can lead a claim | E | None |
| M23.059 | Cystic meniscus, posterior horn of lateral meniscus, unspecified kneeCMS: Cystic meniscus, posterior horn of lat mensc, unsp knee | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M23.06 Cystic meniscus, other lateral meniscus | ||||
| M23.061 | Cystic meniscus, other lateral meniscus, right knee | Can lead a claim | E | None |
| M23.062 | Cystic meniscus, other lateral meniscus, left knee | Can lead a claim | E | None |
| M23.069 | Cystic meniscus, other lateral meniscus, unspecified knee | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M23.2 Derangement of meniscus due to old tear or injury | ||||
| M23.20 Derangement of unspecified meniscus due to old tear or injury | ||||
| M23.200 | Derangement of unspecified lateral meniscus due to old tear or injury, right kneeCMS: Derang of unsp lat mensc due to old tear/inj, right knee | Can lead a claim | E | None |
| M23.201 | Derangement of unspecified lateral meniscus due to old tear or injury, left kneeCMS: Derangement of unsp lat mensc due to old tear/inj, left knee | Can lead a claim | E | None |
| M23.202 | Derangement of unspecified lateral meniscus due to old tear or injury, unspecified kneeCMS: Derangement of unsp lat mensc due to old tear/inj, unsp knee | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M23.203 | Derangement of unspecified medial meniscus due to old tear or injury, right kneeCMS: Derang of unsp medial meniscus due to old tear/inj, r knee | Can lead a claim | E | None |
| M23.204 | Derangement of unspecified medial meniscus due to old tear or injury, left kneeCMS: Derang of unsp medial meniscus due to old tear/inj, l knee | Can lead a claim | E | None |
| M23.205 | Derangement of unspecified medial meniscus due to old tear or injury, unspecified kneeCMS: Derang of unsp medial mensc due to old tear/inj, unsp knee | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M23.206 | Derangement of unspecified meniscus due to old tear or injury, right kneeCMS: Derangement of unsp meniscus due to old tear/inj, right knee | Can lead a claim | E | None |
| M23.207 | Derangement of unspecified meniscus due to old tear or injury, left kneeCMS: Derangement of unsp meniscus due to old tear/inj, left knee | Can lead a claim | E | None |
| M23.209 | Derangement of unspecified meniscus due to old tear or injury, unspecified kneeCMS: Derangement of unsp meniscus due to old tear/inj, unsp knee | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M23.21 Derangement of anterior horn of medial meniscus due to old tear or injury | ||||
| M23.211 | Derangement of anterior horn of medial meniscus due to old tear or injury, right kneeCMS: Derang of ant horn of medial mensc d/t old tear/inj, r knee | Can lead a claim | E | None |
| M23.212 | Derangement of anterior horn of medial meniscus due to old tear or injury, left kneeCMS: Derang of ant horn of medial mensc d/t old tear/inj, l knee | Can lead a claim | E | None |
| M23.219 | Derangement of anterior horn of medial meniscus due to old tear or injury, unspecified kneeCMS: Derang of ant horn of med mensc d/t old tear/inj, unsp knee | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M23.22 Derangement of posterior horn of medial meniscus due to old tear or injury | ||||
| M23.221 | Derangement of posterior horn of medial meniscus due to old tear or injury, right kneeCMS: Derang of post horn of medial mensc d/t old tear/inj, r knee | Can lead a claim | E | None |
| M23.222 | Derangement of posterior horn of medial meniscus due to old tear or injury, left kneeCMS: Derang of post horn of medial mensc d/t old tear/inj, l knee | Can lead a claim | E | None |
| M23.229 | Derangement of posterior horn of medial meniscus due to old tear or injury, unspecified kneeCMS: Derang of post horn of med mensc d/t old tear/inj, unsp knee | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M23.23 Derangement of other medial meniscus due to old tear or injury | ||||
| M23.231 | Derangement of other medial meniscus due to old tear or injury, right kneeCMS: Derang of medial meniscus due to old tear/inj, right knee | Can lead a claim | E | None |
| M23.232 | Derangement of other medial meniscus due to old tear or injury, left kneeCMS: Derang of medial meniscus due to old tear/inj, left knee | Can lead a claim | E | None |
| M23.239 | Derangement of other medial meniscus due to old tear or injury, unspecified kneeCMS: Derang of medial meniscus due to old tear/inj, unsp knee | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M23.24 Derangement of anterior horn of lateral meniscus due to old tear or injury | ||||
| M23.241 | Derangement of anterior horn of lateral meniscus due to old tear or injury, right kneeCMS: Derang of ant horn of lat mensc due to old tear/inj, r knee | Can lead a claim | E | None |
| M23.242 | Derangement of anterior horn of lateral meniscus due to old tear or injury, left kneeCMS: Derang of ant horn of lat mensc due to old tear/inj, l knee | Can lead a claim | E | None |
| M23.249 | Derangement of anterior horn of lateral meniscus due to old tear or injury, unspecified kneeCMS: Derang of ant horn of lat mensc d/t old tear/inj, unsp knee | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M23.25 Derangement of posterior horn of lateral meniscus due to old tear or injury | ||||
| M23.251 | Derangement of posterior horn of lateral meniscus due to old tear or injury, right kneeCMS: Derang of post horn of lat mensc due to old tear/inj, r knee | Can lead a claim | E | None |
| M23.252 | Derangement of posterior horn of lateral meniscus due to old tear or injury, left kneeCMS: Derang of post horn of lat mensc due to old tear/inj, l knee | Can lead a claim | E | None |
| M23.259 | Derangement of posterior horn of lateral meniscus due to old tear or injury, unspecified kneeCMS: Derang of post horn of lat mensc d/t old tear/inj, unsp knee | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M23.26 Derangement of other lateral meniscus due to old tear or injury | ||||
| M23.261 | Derangement of other lateral meniscus due to old tear or injury, right kneeCMS: Derangement of lat mensc due to old tear/inj, right knee | Can lead a claim | E | None |
| M23.262 | Derangement of other lateral meniscus due to old tear or injury, left kneeCMS: Derangement of lat mensc due to old tear/inj, left knee | Can lead a claim | E | None |
| M23.269 | Derangement of other lateral meniscus due to old tear or injury, unspecified kneeCMS: Derangement of lat mensc due to old tear/inj, unsp knee | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M23.3 Other meniscus derangements | ||||
| M23.30 Other meniscus derangements, unspecified meniscus | ||||
| M23.300 | Other meniscus derangements, unspecified lateral meniscus, right kneeCMS: Oth meniscus derangements, unsp lateral meniscus, right knee | Can lead a claim | E | None |
| M23.301 | Other meniscus derangements, unspecified lateral meniscus, left kneeCMS: Oth meniscus derangements, unsp lateral meniscus, left knee | Can lead a claim | E | None |
| M23.302 | Other meniscus derangements, unspecified lateral meniscus, unspecified kneeCMS: Oth meniscus derangements, unsp lateral meniscus, unsp knee | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M23.303 | Other meniscus derangements, unspecified medial meniscus, right kneeCMS: Oth meniscus derangements, unsp medial meniscus, right knee | Can lead a claim | E | None |
| M23.304 | Other meniscus derangements, unspecified medial meniscus, left kneeCMS: Other meniscus derangements, unsp medial meniscus, left knee | Can lead a claim | E | None |
| M23.305 | Other meniscus derangements, unspecified medial meniscus, unspecified kneeCMS: Other meniscus derangements, unsp medial meniscus, unsp knee | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M23.306 | Other meniscus derangements, unspecified meniscus, right kneeCMS: Other meniscus derangements, unsp meniscus, right knee | Can lead a claim | E | None |
| M23.307 | Other meniscus derangements, unspecified meniscus, left knee | Can lead a claim | E | None |
| M23.309 | Other meniscus derangements, unspecified meniscus, unspecified kneeCMS: Other meniscus derangements, unsp meniscus, unspecified knee | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M23.31 Other meniscus derangements, anterior horn of medial meniscus | ||||
| M23.311 | Other meniscus derangements, anterior horn of medial meniscus, right kneeCMS: Oth meniscus derang, ant horn of medial meniscus, r knee | Can lead a claim | E | None |
| M23.312 | Other meniscus derangements, anterior horn of medial meniscus, left kneeCMS: Oth meniscus derang, ant horn of medial meniscus, l knee | Can lead a claim | E | None |
| M23.319 | Other meniscus derangements, anterior horn of medial meniscus, unspecified kneeCMS: Oth meniscus derang, ant horn of medial meniscus, unsp knee | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M23.32 Other meniscus derangements, posterior horn of medial meniscus | ||||
| M23.321 | Other meniscus derangements, posterior horn of medial meniscus, right kneeCMS: Oth meniscus derang, post horn of medial meniscus, r knee | Can lead a claim | E | None |
| M23.322 | Other meniscus derangements, posterior horn of medial meniscus, left kneeCMS: Oth meniscus derang, post horn of medial meniscus, l knee | Can lead a claim | E | None |
| M23.329 | Other meniscus derangements, posterior horn of medial meniscus, unspecified kneeCMS: Oth meniscus derang, post horn of medial meniscus, unsp knee | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M23.33 Other meniscus derangements, other medial meniscus | ||||
| M23.331 | Other meniscus derangements, other medial meniscus, right kneeCMS: Oth meniscus derangements, other medial meniscus, right knee | Can lead a claim | E | None |
| M23.332 | Other meniscus derangements, other medial meniscus, left kneeCMS: Oth meniscus derangements, other medial meniscus, left knee | Can lead a claim | E | None |
| M23.339 | Other meniscus derangements, other medial meniscus, unspecified kneeCMS: Oth meniscus derangements, other medial meniscus, unsp knee | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M23.34 Other meniscus derangements, anterior horn of lateral meniscus | ||||
| M23.341 | Other meniscus derangements, anterior horn of lateral meniscus, right kneeCMS: Oth meniscus derang, anterior horn of lat mensc, right knee | Can lead a claim | E | None |
| M23.342 | Other meniscus derangements, anterior horn of lateral meniscus, left kneeCMS: Oth meniscus derang, anterior horn of lat mensc, left knee | Can lead a claim | E | None |
| M23.349 | Other meniscus derangements, anterior horn of lateral meniscus, unspecified kneeCMS: Oth meniscus derang, anterior horn of lat mensc, unsp knee | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M23.35 Other meniscus derangements, posterior horn of lateral meniscus | ||||
| M23.351 | Other meniscus derangements, posterior horn of lateral meniscus, right kneeCMS: Oth meniscus derang, posterior horn of lat mensc, right knee | Can lead a claim | E | None |
| M23.352 | Other meniscus derangements, posterior horn of lateral meniscus, left kneeCMS: Oth meniscus derang, posterior horn of lat mensc, left knee | Can lead a claim | E | None |
| M23.359 | Other meniscus derangements, posterior horn of lateral meniscus, unspecified kneeCMS: Oth meniscus derang, posterior horn of lat mensc, unsp knee | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M23.36 Other meniscus derangements, other lateral meniscus | ||||
| M23.361 | Other meniscus derangements, other lateral meniscus, right kneeCMS: Oth meniscus derangements, oth lateral meniscus, right knee | Can lead a claim | E | None |
| M23.362 | Other meniscus derangements, other lateral meniscus, left kneeCMS: Oth meniscus derangements, other lateral meniscus, left knee | Can lead a claim | E | None |
| M23.369 | Other meniscus derangements, other lateral meniscus, unspecified kneeCMS: Oth meniscus derangements, other lateral meniscus, unsp knee | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M23.4 Loose body in knee | ||||
| M23.40 | Loose body in knee, unspecified knee | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M23.41 | Loose body in knee, right knee | Can lead a claim | E | None |
| M23.42 | Loose body in knee, left knee | Can lead a claim | E | None |
| M23.5 Chronic instability of knee | ||||
| M23.50 | Chronic instability of knee, unspecified knee | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M23.51 | Chronic instability of knee, right knee | Can lead a claim | E | None |
| M23.52 | Chronic instability of knee, left knee | Can lead a claim | E | None |
| M23.6 Other spontaneous disruption of ligament(s) of knee | ||||
| M23.60 Other spontaneous disruption of unspecified ligament of knee | ||||
| M23.601 | Other spontaneous disruption of unspecified ligament of right kneeCMS: Other spontaneous disruption of unsp ligament of right knee | Can lead a claim | E | None |
| M23.602 | Other spontaneous disruption of unspecified ligament of left kneeCMS: Other spontaneous disruption of unsp ligament of left knee | Can lead a claim | E | None |
| M23.609 | Other spontaneous disruption of unspecified ligament of unspecified kneeCMS: Other spontaneous disruption of unsp ligament of unsp knee | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M23.61 Other spontaneous disruption of anterior cruciate ligament of knee | ||||
| M23.611 | Other spontaneous disruption of anterior cruciate ligament of right kneeCMS: Oth spon disrupt of anterior cruciate ligament of right knee | Can lead a claim | E | None |
| M23.612 | Other spontaneous disruption of anterior cruciate ligament of left kneeCMS: Oth spon disrupt of anterior cruciate ligament of left knee | Can lead a claim | E | None |
| M23.619 | Other spontaneous disruption of anterior cruciate ligament of unspecified kneeCMS: Oth spon disrupt of anterior cruciate ligament of unsp knee | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M23.62 Other spontaneous disruption of posterior cruciate ligament of knee | ||||
| M23.621 | Other spontaneous disruption of posterior cruciate ligament of right kneeCMS: Oth spon disrupt of posterior cruciate ligament of r knee | Can lead a claim | E | None |
| M23.622 | Other spontaneous disruption of posterior cruciate ligament of left kneeCMS: Oth spon disrupt of posterior cruciate ligament of left knee | Can lead a claim | E | None |
| M23.629 | Other spontaneous disruption of posterior cruciate ligament of unspecified kneeCMS: Oth spon disrupt of posterior cruciate ligament of unsp knee | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M23.63 Other spontaneous disruption of medial collateral ligament of knee | ||||
| M23.631 | Other spontaneous disruption of medial collateral ligament of right kneeCMS: Oth spon disruption of medial collat ligament of right knee | Can lead a claim | E | None |
| M23.632 | Other spontaneous disruption of medial collateral ligament of left kneeCMS: Oth spon disruption of medial collat ligament of left knee | Can lead a claim | E | None |
| M23.639 | Other spontaneous disruption of medial collateral ligament of unspecified kneeCMS: Oth spon disruption of medial collat ligament of unsp knee | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M23.64 Other spontaneous disruption of lateral collateral ligament of knee | ||||
| M23.641 | Other spontaneous disruption of lateral collateral ligament of right kneeCMS: Oth spon disruption of lateral collat ligament of right knee | Can lead a claim | E | None |
| M23.642 | Other spontaneous disruption of lateral collateral ligament of left kneeCMS: Oth spon disruption of lateral collat ligament of left knee | Can lead a claim | E | None |
| M23.649 | Other spontaneous disruption of lateral collateral ligament of unspecified kneeCMS: Oth spon disruption of lateral collat ligament of unsp knee | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M23.67 Other spontaneous disruption of capsular ligament of knee | ||||
| M23.671 | Other spontaneous disruption of capsular ligament of right kneeCMS: Oth spon disruption of capsular ligament of right knee | Can lead a claim | E | None |
| M23.672 | Other spontaneous disruption of capsular ligament of left kneeCMS: Oth spontaneous disruption of capsular ligament of left knee | Can lead a claim | E | None |
| M23.679 | Other spontaneous disruption of capsular ligament of unspecified kneeCMS: Oth spontaneous disruption of capsular ligament of unsp knee | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M23.8 Other internal derangements of knee | ||||
| M23.8X Other internal derangements of knee | ||||
| M23.8X1 | Other internal derangements of right knee | Can lead a claim | E | None |
| M23.8X2 | Other internal derangements of left knee | Can lead a claim | E | None |
| M23.8X9 | Other internal derangements of unspecified knee | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M23.9 Unspecified internal derangement of knee | ||||
| M23.90 | Unspecified internal derangement of unspecified knee | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M23.91 | Unspecified internal derangement of right knee | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M23.92 | Unspecified internal derangement of left knee | 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.
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