2019 ICD-10-CM Diagnosis Code H70.9

Unspecified mastoiditis

    2016 2017 2018 2019 Non-Billable/Non-Specific Code
  • H70.9 should not be used for reimbursement purposes as there are multiple codes below it that contain a greater level of detail.
  • The 2019 edition of ICD-10-CM H70.9 became effective on October 1, 2018.
  • This is the American ICD-10-CM version of H70.9 - other international versions of ICD-10 H70.9 may differ.
The following code(s) above H70.9 contain annotation back-references
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
  • Applicable To annotations, or
  • Code Also annotations, or
  • Code First annotations, or
  • Excludes1 annotations, or
  • Excludes2 annotations, or
  • Includes annotations, or
  • Note annotations, or
  • Use Additional annotations
that may be applicable to H70.9:
  • H60-H95
    2019 ICD-10-CM Range H60-H95

    Diseases of the ear and mastoid process

    • Use an external cause code following the code for the ear condition, if applicable, to identify the cause of the ear condition
    Type 2 Excludes
    • certain conditions originating in the perinatal period (P04-P96)
    • certain infectious and parasitic diseases (A00-B99)
    • complications of pregnancy, childbirth and the puerperium (O00-O9A)
    • congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
    • endocrine, nutritional and metabolic diseases (E00-E88)
    • injury, poisoning and certain other consequences of external causes (S00-T88)
    • neoplasms (C00-D49)
    • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
    Diseases of the ear and mastoid process
Clinical Information
  • Inflammation of the honeycomb-like mastoid bone in the skull just behind the ear. It is usually a complication of otitis media.
Code History
  • 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
  • 2017 (effective 10/1/2016): No change
  • 2018 (effective 10/1/2017): No change
  • 2019 (effective 10/1/2018): No change

Diagnosis Index entries containing back-references to H70.9:
  • Mastoiditis (coalescent) (hemorrhagic) (suppurative) H70.9-

ICD-10-CM Codes Adjacent To H70.9
H70.81 Postauricular fistula
H70.811 …… right ear
H70.812 …… left ear
H70.813 …… bilateral
H70.819 …… unspecified ear
H70.89 Other mastoiditis and related conditions
H70.891 …… right ear
H70.892 …… left ear
H70.893 …… bilateral
H70.899 …… unspecified ear
H70.9 Unspecified mastoiditis
H70.90 …… unspecified ear
H70.91 …… right ear
H70.92 …… left ear
H70.93 …… bilateral
H71 Cholesteatoma of middle ear
H71.0 Cholesteatoma of attic
H71.00 …… unspecified ear
H71.01 …… right ear
H71.02 …… left ear
H71.03 …… bilateral

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.