2027 ICD-10-CM Diagnosis Code J93.9Pneumothorax, unspecified
ICD-10-CM Codes›J00–J99›J90-J94›J93
- Billable — Valid for Submission
- CC — Complication or Comorbidity
- Not Chronic
J93.9 is a billable ICD-10-CM diagnosis code for pneumothorax, unspecified. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 199 through 201. As a secondary diagnosis, it counts as a complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within its MS-DRG family. It does not count, however, when the principal diagnosis is one of 18 closely related codes. Coders also document this condition as clicking pneumothorax. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Pneumothorax.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Clicking pneumothorax
- Closed pneumothorax
- Left pneumothorax
- Pneumothorax
- Right pneumothorax
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to J93.9: its own notes plus those printed at J93 and Chapter 10. A note printed at a category, block or chapter applies to every code under it.
Applicable To
Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.
- Pneumothorax NOS
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)
- endocrine, nutritional and metabolic diseases (E00-E88)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- smoke inhalation (T59.81-)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
Notes
General instructions on how these codes are used.
- When a respiratory condition is described as occurring in more than one site and is not specifically indexed, it should be classified to the lower anatomic site (e.g. tracheobronchitis to bronchitis in J40).
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name J93.9, its category, or a range that includes it.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Pneumothorax NOS J93.9
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Pneumothorax
an accumulation of air or gas in the pleural cavity, which may occur spontaneously or as a result of trauma or a pathological process. the gas may also be introduced deliberately during pneumothorax, artificial.
Patient EducationClinical
Pleural Disorders
Your pleura is a large, thin sheet of tissue that wraps around the outside of your lungs and lines the inside of your chest cavity. Between the layers of the pleura is a very thin space. Normally it's filled with a small amount of fluid.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert J93.9 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About J93.9Overview
What is the ICD-10 code for pneumothorax, unspecified?
The ICD-10-CM code for pneumothorax, unspecified is J93.9 (sometimes written as J939). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is J93.9 (Pneumothorax and air leak) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report pneumothorax, unspecified on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does J93.9 group to?
When pneumothorax, unspecified is the principal diagnosis on an inpatient stay, it groups to MS-DRG 201, 199, 200, with relative weights from 0.6782 to 1.7314 depending on complications. Higher weights mean higher Medicare reimbursement.
Is J93.9 a CC or MCC?
CMS lists J93.9 as a CC (complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 18 closely related codes in its exclusion list.
Can J93.9 be reported with P25.1?
Not as a rule. The Excludes1 note at J93, which applies to J93.9, lists "congenital or perinatal pneumothorax (P25.1)". 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).
