H95.139 Mucosal cyst of postmastoidectomy cavity, unspecified ear

The ICD-10-CM code for Mucosal cyst of postmastoidectomy cavity, unspecified ear is H95.139 (FY2026). It is a billable, claim-ready diagnosis code.

Classification

Chapter

8: Diseases of the ear and mastoid process (H60-H95)

Section

H95: Intraoperative and postprocedural complications and disorders of ear and mastoid process, not elsewhere classified (H95)

Category H95

49 codes (36 billable)

FY2026 Status

Stable since FY2024

U.S. Hospital Utilization

H95.139 appeared in too few sampled U.S. inpatient stays in 2020 to report a national estimate (AHRQ suppresses counts of 10 or fewer) — a rare inpatient diagnosis.

Source: National Inpatient Sample (NIS), Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality, 2016–2023. National survey-weighted estimates.

Official Coding Guidelines

Chapter 8 reserved for future guideline expansion

8. Chapter 8: Diseases of the Ear and Mastoid Process (H60-H95) Reserved for future guideline expansion

Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026

References

• CMS — ICD-10-CM Official Code Set and Guidelines, FY2026
• CDC/NCHS — ICD-10-CM Files and Browser Tool
• AHRQ — HCUP National Inpatient Sample, Frequencies by Diagnosis Code (2016–2023)

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H95.139 — Mucosal cyst of postmastoidectomy cavity, unspecified ear. ICD-10 Coding Pro (ICD-10-CM FY2026). https://icd10codingpro.com/codes/H95.139

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