2027 ICD-10-CM Diagnosis Code H05.00Unspecified acute inflammation of orbit
ICD-10-CM Codes›H00–H59›H00-H05›H05
- Billable — Valid for Submission
- Not Chronic
H05.00 is a billable ICD-10-CM diagnosis code for unspecified acute inflammation of orbit. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 124 through 125. Coders also document this condition as acute dacryocystitis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Oculofacial plastics and orbital conditions.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Acute dacryocystitis
- Acute disease of orbit
- Acute inflammation of orbit
- Acute peridacryocystitis
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to H05.00: its own notes plus those printed at H05, block H00-H05, and Chapter 7. A note printed at a category, block or chapter applies to every code under it.
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
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)
- diabetes mellitus related eye conditions (E09.3-, E10.3-, E11.3-, E13.3-)
- endocrine, nutritional and metabolic diseases (E00-E88)
- injury (trauma) of eye and orbit (S05.-)
- 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)
- syphilis related eye disorders (A50.01, A50.3-, A51.43, A52.71)
Notes
General instructions on how these codes are used.
- Use an external cause code following the code for the eye condition, if applicable, to identify the cause of the eye 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 H05.00, its category, or a range that includes it.
Excludes2 2
These codes carry an Excludes2 note naming H05.00: its condition is not part of those codes, and both may be reported when the patient has both.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Eye Diseases
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Read the full article at MedlinePlus
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Convert H05.00 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About H05.00Overview
What is the ICD-10 code for unspecified acute inflammation of orbit?
The ICD-10-CM code for unspecified acute inflammation of orbit is H05.00 (sometimes written as H0500). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is H05.00 (Acute inflammation of orbit) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report unspecified acute inflammation of orbit on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does H05.00 group to?
When unspecified acute inflammation of orbit is the principal diagnosis on an inpatient stay, it groups to MS-DRG 125, 124, with relative weights from 0.7699 to 1.2470 depending on complications. Higher weights mean higher Medicare reimbursement.
Can H05.00 be reported with Q10.7?
Not as a rule. The Excludes1 note at H05, which applies to H05.00, lists "congenital malformation of orbit (Q10.7)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).
What is the ICD-9 equivalent of H05.00?
Under the General Equivalence Mappings, unspecified acute inflammation of orbit converts to ICD-9-CM 376.00 (acute inflam NOS, orbit). The mapping is a direct match.
