2027 ICD-10-CM Diagnosis Code H70.209Unspecified petrositis, unspecified ear
ICD-10-CM Codes›H60–H95›H65-H75›H70
- Billable — Valid for Submission
- Not Chronic
H70.209 is a billable ICD-10-CM diagnosis code for unspecified petrositis, unspecified ear. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 152 through 153. Coders also document this condition as coalescing osteitis of petrous bone. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Diseases of middle ear and mastoid (except otitis media).
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Coalescing osteitis of petrous bone
- Cranial neuropathy due to petrous infection
- Osteomyelitis of petrous bone
- Osteomyelitis of temporal bone
- Petrositis
- Petrous apicitis
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to H70.209: its own notes plus those printed at Chapter 8. A note printed at a category, block or chapter applies to every code under it.
Excludes2
Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.
- 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)
Notes
General instructions on how these codes are used.
- Use an external cause code following the code for the ear condition, if applicable, to identify the cause of the ear condition
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name H70.209, its category, or a range that includes it.
Excludes2 2
These codes carry an Excludes2 note naming H70.209: its condition is not part of those codes, and both may be reported when the patient has both.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Petrositis
inflammation of petrous bone.
Patient EducationClinical
Ear Infections
Ear infections are the most common reason parents bring their child to a doctor. Three out of four children will have at least one ear infection by their third birthday. Adults can also get ear infections, but they are less common.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert H70.209 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About H70.209Overview
What is the ICD-10 code for unspecified petrositis, unspecified ear?
The ICD-10-CM code for unspecified petrositis, unspecified ear is H70.209 (sometimes written as H70209). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is H70.209 (Unspecified petrositis) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report unspecified petrositis, unspecified ear on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does H70.209 group to?
When unspecified petrositis, unspecified ear is the principal diagnosis on an inpatient stay, it groups to MS-DRG 152, 153, with relative weights from 0.7420 to 1.1147 depending on complications. Higher weights mean higher Medicare reimbursement.
What is the ICD-9 equivalent of H70.209?
Under the General Equivalence Mappings, unspecified petrositis, unspecified ear converts to ICD-9-CM 383.20 (petrositis NOS). The mapping is approximate, so confirm the match fits the documentation.
