ICD-10-CM Codes
H60-H95 Diseases of the ear and mastoid process
H65-H75 Diseases of middle ear and mastoid
H70- Mastoiditis and related conditions
2021 ICD-10-CM Diagnosis Code H70.1

2021 ICD-10-CM Diagnosis Code H70.1

Chronic mastoiditis

2016

2017

2018

2019

2020

2021

Non-Billable/Non-Specific Code

H70.1 should not be used for reimbursement purposes as there are multiple codes below it that contain a greater level of detail.
The 2021 edition of ICD-10-CM H70.1 became effective on October 1, 2020.
This is the American ICD-10-CM version of H70.1 - other international versions of ICD-10 H70.1 may differ.

Applicable To

Caries of mastoid
Fistula of mastoid

Type 1 Excludes

Type 1 Excludes Help

A type 1 excludes note is a pure excludes. It means "not coded here". A type 1 excludes note indicates that the code excluded should never be used at the same time as H70.1. A type 1 excludes note is for used for when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.

tuberculous mastoiditis (
ICD-10-CM Diagnosis Code A18.03
Tuberculosis of other bones
Applicable To
- Tuberculous mastoiditis
- Tuberculous osteomyelitis
A18.03
)

The following code(s) above H70.1 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 H70.1:

H60-H95
2021 ICD-10-CM Range H60-H95
Diseases of the ear and mastoid process
Note
- 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

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
2020 (effective 10/1/2019): No change
2021 (effective 10/1/2020): No change

Diagnosis Index entries containing back-references to H70.1:

Mastoiditis (coalescent) (hemorrhagic) (suppurative) H70.9-
ICD-10-CM Diagnosis Code H70.9-
Unspecified mastoiditis
- chronic H70.1- (necrotic) (recurrent)

ICD-10-CM Codes Adjacent To H70.1

H70.01 Subperiosteal abscess of mastoid

H70.011 …… right ear

H70.012 …… left ear

H70.013 …… bilateral

H70.019 …… unspecified ear

H70.09 Acute mastoiditis with other complications

H70.091 …… right ear

H70.092 …… left ear

H70.093 …… bilateral

H70.099 …… unspecified ear

H70.1 Chronic mastoiditis

H70.10 …… unspecified ear

H70.11 …… right ear

H70.12 …… left ear

H70.13 …… bilateral

H70.2 Petrositis

H70.20 Unspecified petrositis

H70.201 …… right ear

H70.202 …… left ear

H70.203 …… bilateral

H70.209 …… unspecified ear

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

2021 ICD-10-CM Diagnosis Code H70.1

Chronic mastoiditis

Tuberculosis of other bones

Diseases of the ear and mastoid process

Unspecified mastoiditis