DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

M79 Other and unspecified soft tissue disorders, not elsewhere classified

  • Header · not billable

M79 is not billable. The category heads 52 billable codes in FY2027, grouped under 11 subdivisions.

Index → code

Where it sits

  1. Chapter 13 Diseases of the musculoskeletal system and connective tissue (M00-M99)
  2. M70-M79 Other soft tissue disorders (M70-M79)
  3. M79 Other and unspecified soft tissue disorders, not elsewhere classified
Billable codes
52
Subdivisions
11
CC / MCC codes
8 / 0
HCC V28 codes
0
New FY2027
0
Index entries
73

Codes in M79

  1. M79.0
    Rheumatism, unspecified
    Billable
    Excludes1 2

    Excludes1

    • fibromyalgia (M79.7) M79.7
    • palindromic rheumatism (M12.3-) M12.3
  2. M79.1
    Myalgia
    Header
    Inclusion terms 1, Excludes1 2

    Inclusion terms

    • Myofascial pain syndrome

    Excludes1

    • fibromyalgia (M79.7) M79.7
    • myositis (M60.-) M60
  3. M79.10
    Myalgia, unspecified site
    Billable
  4. M79.11
    Myalgia of mastication muscle
    Billable
  5. M79.12
    Myalgia of auxiliary muscles, head and neck
    Billable
  6. M79.18
    Myalgia, other site
    Billable
  7. M79.2
    Neuralgia and neuritis, unspecified
    Billable
    Excludes1 5

    Excludes1

    • brachial radiculitis NOS (M54.1) M54.1
    • lumbosacral radiculitis NOS (M54.1) M54.1
    • mononeuropathies (G56-G58) G56 G58
    • radiculitis NOS (M54.1) M54.1
    • sciatica (M54.3-M54.4) M54.3 M54.4
  8. M79.3
    Panniculitis, unspecified
    Billable
    Excludes1 3

    Excludes1

    • lupus panniculitis (L93.2) L93.2
    • neck and back panniculitis (M54.0-) M54.0
    • relapsing [Weber-Christian] panniculitis (M35.6) M35.6
  9. M79.4
    Hypertrophy of (infrapatellar) fat pad
    Billable
  10. M79.5
    Residual foreign body in soft tissue
    Billable
    Excludes1 2

    Excludes1

    • foreign body granuloma of skin and subcutaneous tissue (L92.3) L92.3
    • foreign body granuloma of soft tissue (M60.2-) M60.2
  11. M79.6
    Pain in limb, hand, foot, fingers and toes
    Header
    Excludes2 1

    Excludes2

    • pain in joint (M25.5-) M25.5
  12. M79.60
    Pain in limb, unspecified
    Header
  13. M79.601
    Pain in right arm
    Billable
    Inclusion terms 1

    Inclusion terms

    • Pain in right upper limb NOS
  14. M79.602
    Pain in left arm
    Billable
    Inclusion terms 1

    Inclusion terms

    • Pain in left upper limb NOS
  15. M79.603
    Pain in arm, unspecified
    Billable
    Inclusion terms 1

    Inclusion terms

    • Pain in upper limb NOS
  16. M79.604
    Pain in right leg
    Billable
    Inclusion terms 1

    Inclusion terms

    • Pain in right lower limb NOS
  17. M79.605
    Pain in left leg
    Billable
    Inclusion terms 1

    Inclusion terms

    • Pain in left lower limb NOS
  18. M79.606
    Pain in leg, unspecified
    Billable
    Inclusion terms 1

    Inclusion terms

    • Pain in lower limb NOS
  19. M79.609
    Pain in unspecified limb
    Billable
    Inclusion terms 1

    Inclusion terms

    • Pain in limb NOS
  20. M79.62
    Pain in upper arm
    Header
    Inclusion terms 1

    Inclusion terms

    • Pain in axillary region
  21. M79.621
    Pain in right upper arm
    Billable
  22. M79.622
    Pain in left upper arm
    Billable
  23. M79.629
    Pain in unspecified upper arm
    Billable
  24. M79.63
    Pain in forearm
    Header
  25. M79.631
    Pain in right forearm
    Billable
  26. M79.632
    Pain in left forearm
    Billable
  27. M79.639
    Pain in unspecified forearm
    Billable
  28. M79.64
    Pain in hand and fingers
    Header
  29. M79.641
    Pain in right hand
    Billable
  30. M79.642
    Pain in left hand
    Billable
  31. M79.643
    Pain in unspecified hand
    Billable
  32. M79.644
    Pain in right finger(s)
    Billable
  33. M79.645
    Pain in left finger(s)
    Billable
  34. M79.646
    Pain in unspecified finger(s)
    Billable
  35. M79.65
    Pain in thigh
    Header
  36. M79.651
    Pain in right thigh
    Billable
  37. M79.652
    Pain in left thigh
    Billable
  38. M79.659
    Pain in unspecified thigh
    Billable
  39. M79.66
    Pain in lower leg
    Header
  40. M79.661
    Pain in right lower leg
    Billable
  41. M79.662
    Pain in left lower leg
    Billable
  42. M79.669
    Pain in unspecified lower leg
    Billable
  43. M79.67
    Pain in foot and toes
    Header
  44. M79.671
    Pain in right foot
    Billable
  45. M79.672
    Pain in left foot
    Billable
  46. M79.673
    Pain in unspecified foot
    Billable
  47. M79.674
    Pain in right toe(s)
    Billable
  48. M79.675
    Pain in left toe(s)
    Billable
  49. M79.676
    Pain in unspecified toe(s)
    Billable
  50. M79.7
    Fibromyalgia
    Billable
    Inclusion terms 3

    Inclusion terms

    • Fibromyositis
    • Fibrositis
    • Myofibrositis
  51. M79.A
    Nontraumatic compartment syndrome
    Header
    Excludes1 4, Code first 1

    Excludes1

    • compartment syndrome NOS (T79.A-) T79.A
    • fibromyalgia (M79.7) M79.7
    • nontraumatic ischemic infarction of muscle (M62.2-) M62.2
    • traumatic compartment syndrome (T79.A-) T79.A

    Code first

    • , if applicable, associated postprocedural complication
  52. M79.A1
    Nontraumatic compartment syndrome of upper extremity
    Header
    Inclusion terms 1

    Inclusion terms

    • Nontraumatic compartment syndrome of shoulder, arm, forearm, wrist, hand, and fingers
  53. M79.A11
    Nontraumatic compartment syndrome of right upper extremity
    BillableCC
  54. M79.A12
    Nontraumatic compartment syndrome of left upper extremity
    BillableCC
  55. M79.A19
    Nontraumatic compartment syndrome of unspecified upper extremity
    BillableCC
  56. M79.A2
    Nontraumatic compartment syndrome of lower extremity
    Header
    Inclusion terms 1

    Inclusion terms

    • Nontraumatic compartment syndrome of hip, buttock, thigh, leg, foot, and toes
  57. M79.A21
    Nontraumatic compartment syndrome of right lower extremity
    BillableCC
  58. M79.A22
    Nontraumatic compartment syndrome of left lower extremity
    BillableCC
  59. M79.A29
    Nontraumatic compartment syndrome of unspecified lower extremity
    BillableCC
  60. M79.A3
    Nontraumatic compartment syndrome of abdomen
    BillableCC
  61. M79.A9
    Nontraumatic compartment syndrome of other sites
    BillableCC
  62. M79.8
    Other specified soft tissue disorders
    Header
  63. M79.81
    Nontraumatic hematoma of soft tissue
    Billable
    Inclusion terms 2

    Inclusion terms

    • Nontraumatic hematoma of muscle
    • Nontraumatic seroma of muscle and soft tissue
  64. M79.89
    Other specified soft tissue disorders
    Billable
    Inclusion terms 1

    Inclusion terms

    • Polyalgia
  65. M79.9
    Soft tissue disorder, unspecified
    Billable

CC/MCC: as a secondary diagnosis, unless the principal diagnosis is on the code’s PDX exclusion list (MS-DRG v44 Appendix C; list on the code card).

Sources of each column.

Instructions

At M79

Excludes1

  • psychogenic rheumatism (F45.8) F45.8
  • soft tissue pain, psychogenic (F45.41) F45.41

Notes that also apply

Chapter 13 instructions (Notes 1, Excludes2 10): printed on the chapter 13 page.

Index entries

  • Rheumatism (articular) (neuralgic) (nonarticular) → M79.0
  • Myalgia → M79.10
  • Neuralgia, neuralgic (acute) → M79.2
  • Neuritis (rheumatoid) → M79.2
  • Lipodermatosclerosis → M79.3
  • Panniculitis (nodular) (nonsuppurative) → M79.3
  • Fibromyalgia → M79.7
  • Fibromyositis → M79.7
  • Fibrositis (periarticular) → M79.7
  • Myofibrositis → M79.7
  • Cheiromegaly → M79.89
  • Polyalgia → M79.89
  • Soremuscle → M79.10
  • Myalgiamastication muscle → M79.11
  • Myalgiaauxiliary muscles, head and neck → M79.12
  • Myalgiasite specified NEC → M79.18
  • Pain(s)musculoskeletal → M79.18
  • Pain(s)myofascial → M79.18
  • Syndromemyofascial pain → M79.18
  • Degeneration, degenerativeinfrapatellar fat pad → M79.4
  • Degeneration, degenerativepopliteal fat pad → M79.4
  • Fibrosis, fibroticinfrapatellar fat pad → M79.4
  • Fibrosis, fibroticpopliteal fat pad → M79.4
  • Pain(s)limb → M79.609
  • Pain(s)axillary (axilla) → M79.62-
  • Swelling (of)arm → M79.89
  • Swelling (of)finger → M79.89
  • Swelling (of)foot → M79.89
  • Swelling (of)hand → M79.89
  • Swelling (of)leg → M79.89
  • Swelling (of)toe → M79.89
  • Disorder (of)soft tissue → M79.9
  • Fatlocalized (pad)knee → M79.4
  • Fatlocalized (pad)retropatellar → M79.4
  • Fatpadknee → M79.4
  • Hypertrophy, hypertrophicfat padknee (infrapatellar) (popliteal) (prepatellar) (retropatellar) → M79.4
  • Foreign bodyinsoft tissue (residual) → M79.5
  • Foreign bodyold or residualsoft tissue (residual) → M79.5
  • Foreign bodyretained (old) (nonmagnetic) (in)soft tissue → M79.5
  • Pain(s)limblower → M79.60-

33 more, longer entries are not listed; the search box finds them by word.

NCHS Alphabetic Index. Index first, then the Tabular List.

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