DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

H70 Mastoiditis and related conditions

  • Header · not billable

H70 is not billable. The category heads 40 billable codes in FY2027, grouped under 5 subdivisions.

Index → code

  • Petrositis → H70.20-
  • Mastoiditis (coalescent) (hemorrhagic) (suppurative) → H70.9-
  • Petrositisacute → H70.21-

Where it sits

  1. Chapter 8 Diseases of the ear and mastoid process (H60-H95)
  2. H65-H75 Diseases of middle ear and mastoid (H65-H75)
  3. H70 Mastoiditis and related conditions
Billable codes
40
Subdivisions
5
CC / MCC codes
12 / 0
HCC V28 codes
0
New FY2027
0
Index entries
10

Codes in H70

  1. H70.0
    Acute mastoiditis
    Header
    Inclusion terms 2

    Inclusion terms

    • Abscess of mastoid
    • Empyema of mastoid
  2. H70.00
    Acute mastoiditis without complications
    Header
  3. H70.001
    Acute mastoiditis without complications, right ear
    BillableCC
  4. H70.002
    Acute mastoiditis without complications, left ear
    BillableCC
  5. H70.003
    Acute mastoiditis without complications, bilateral
    BillableCC
  6. H70.009
    Acute mastoiditis without complications, unspecified ear
    BillableCC
  7. H70.01
    Subperiosteal abscess of mastoid
    Header
  8. H70.011
    Subperiosteal abscess of mastoid, right ear
    BillableCC
  9. H70.012
    Subperiosteal abscess of mastoid, left ear
    BillableCC
  10. H70.013
    Subperiosteal abscess of mastoid, bilateral
    BillableCC
  11. H70.019
    Subperiosteal abscess of mastoid, unspecified ear
    BillableCC
  12. H70.09
    Acute mastoiditis with other complications
    Header
  13. H70.091
    Acute mastoiditis with other complications, right ear
    BillableCC
  14. H70.092
    Acute mastoiditis with other complications, left ear
    BillableCC
  15. H70.093
    Acute mastoiditis with other complications, bilateral
    BillableCC
  16. H70.099
    Acute mastoiditis with other complications, unspecified ear
    BillableCC
  17. H70.1
    Chronic mastoiditis
    Header
    Inclusion terms 2, Excludes1 1

    Inclusion terms

    • Caries of mastoid
    • Fistula of mastoid

    Excludes1

    • tuberculous mastoiditis (A18.03) A18.03
  18. H70.10
    Chronic mastoiditis, unspecified ear
    Billable
  19. H70.11
    Chronic mastoiditis, right ear
    Billable
  20. H70.12
    Chronic mastoiditis, left ear
    Billable
  21. H70.13
    Chronic mastoiditis, bilateral
    Billable
  22. H70.2
    Petrositis
    Header
    Inclusion terms 1

    Inclusion terms

    • Inflammation of petrous bone
  23. H70.20
    Unspecified petrositis
    Header
  24. H70.201
    Unspecified petrositis, right ear
    Billable
  25. H70.202
    Unspecified petrositis, left ear
    Billable
  26. H70.203
    Unspecified petrositis, bilateral
    Billable
  27. H70.209
    Unspecified petrositis, unspecified ear
    Billable
  28. H70.21
    Acute petrositis
    Header
  29. H70.211
    Acute petrositis, right ear
    Billable
  30. H70.212
    Acute petrositis, left ear
    Billable
  31. H70.213
    Acute petrositis, bilateral
    Billable
  32. H70.219
    Acute petrositis, unspecified ear
    Billable
  33. H70.22
    Chronic petrositis
    Header
  34. H70.221
    Chronic petrositis, right ear
    Billable
  35. H70.222
    Chronic petrositis, left ear
    Billable
  36. H70.223
    Chronic petrositis, bilateral
    Billable
  37. H70.229
    Chronic petrositis, unspecified ear
    Billable
  38. H70.8
    Other mastoiditis and related conditions
    Header
    Excludes1 2

    Excludes1

    • preauricular sinus and cyst (Q18.1) Q18.1
    • sinus, fistula, and cyst of branchial cleft (Q18.0) Q18.0
  39. H70.81
    Postauricular fistula
    Header
  40. H70.811
    Postauricular fistula, right ear
    Billable
  41. H70.812
    Postauricular fistula, left ear
    Billable
  42. H70.813
    Postauricular fistula, bilateral
    Billable
  43. H70.819
    Postauricular fistula, unspecified ear
    Billable
  44. H70.89
    Other mastoiditis and related conditions
    Header
  45. H70.891
    Other mastoiditis and related conditions, right ear
    Billable
  46. H70.892
    Other mastoiditis and related conditions, left ear
    Billable
  47. H70.893
    Other mastoiditis and related conditions, bilateral
    Billable
  48. H70.899
    Other mastoiditis and related conditions, unspecified ear
    Billable
  49. H70.9
    Unspecified mastoiditis
    Header
  50. H70.90
    Unspecified mastoiditis, unspecified ear
    Billable
  51. H70.91
    Unspecified mastoiditis, right ear
    Billable
  52. H70.92
    Unspecified mastoiditis, left ear
    Billable
  53. H70.93
    Unspecified mastoiditis, bilateral
    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

Notes that also apply

Chapter 8 instructions (Notes 1, Excludes2 8): printed on the chapter 8 page.

Index entries

  • Petrositis → H70.20-
  • Mastoiditis (coalescent) (hemorrhagic) (suppurative) → H70.9-
  • Mastoiditis (coalescent) (hemorrhagic) (suppurative)acute, subacute → H70.00-
  • Mastoiditis (coalescent) (hemorrhagic) (suppurative)chronic (necrotic) (recurrent) → H70.1-
  • Petrositisacute → H70.21-
  • Petrositischronic → H70.22-
  • Fistula (cutaneous)postauricular → H70.81-
  • Mastoiditis (coalescent) (hemorrhagic) (suppurative)specified NEC → H70.89-
  • Mastoiditis (coalescent) (hemorrhagic) (suppurative)acute, subacutesubperiosteal → H70.01-
  • Mastoiditis (coalescent) (hemorrhagic) (suppurative)acute, subacutecomplicated NEC → H70.09-

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

Hierarchy