2026 ICD-10-CM Diagnosis Code I30.1Infective pericarditis
ICD-10-CM Codes›I00–I99›I30-I5A›I30
- Billable — Valid for Submission
- CC — Complication or Comorbidity
- Not Chronic
I30.1 is a billable ICD-10-CM diagnosis code for infective pericarditis. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 314 through 316. 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 16 closely related codes. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Pericarditis and pericardial disease.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Acute bacterial pericarditis
- Acute infective pericarditis
- Acute pneumococcal pericarditis
- Acute purulent pericarditis
- Acute staphylococcal pericarditis
- Acute streptococcal pericarditis
- Acute viral pericarditis
- Bacterial pericarditis
- Constrictive pericarditis
- Constrictive pericarditis caused by virus
- Infectious pericarditis
- Infective constrictive pericarditis
- Mycotic pericarditis
- Parasitic pericarditis
- Pericarditis caused by Haemophilus
- Pneumopyopericardium
- Pyogenic pericarditis
- Pyopericardium
- Viral pericarditis
- Viral pericarditis - virus unidentified
- Viral pericarditis with pericardial effusion
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Inclusion Terms
- Pneumococcal pericarditis
- Pneumopyopericardium
- Purulent pericarditis
- Pyopericarditis
- Pyopericardium
- Pyopneumopericardium
- Staphylococcal pericarditis
- Streptococcal pericarditis
- Suppurative pericarditis
- Viral pericarditis
Use Additional Code
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
The “use additional code” indicates that a secondary code could be used to further specify the patient’s condition. This note is not mandatory and is only used if enough information is available to assign an additional code.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Abscess (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic) L02.91
pericardial I30.1
Pericarditis (with decompensation) (with effusion) I31.9
bacterial (acute) (subacute) (with serous or seropurulent effusion) I30.1
fibrinopurulent I30.1
infective I30.1
pneumococcal I30.1
purulent I30.1
septic I30.1
staphylococcal I30.1
streptococcal I30.1
suppurative I30.1
Pneumopyopericardium I30.1
Pyopneumopericardium I30.1
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Bacterial Pericarditis
pericarditis that is caused by an infection with a bacterial agent.Viral Pericarditis
pericarditis that is caused by an infection with a viral agent.
Patient EducationClinical
Pericardial Disorders
The pericardium is a membrane, or sac, that surrounds your heart. It holds the heart in place and helps it work properly. Problems with the pericardium include:
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert I30.1 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About I30.1Overview
What is the ICD-10 code for infective pericarditis?
The ICD-10-CM code for infective pericarditis is I30.1 (sometimes written as I301). It is billable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
Is I30.1 (Acute pericarditis) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report infective pericarditis on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does I30.1 group to?
When infective pericarditis is the principal diagnosis on an inpatient stay, it groups to MS-DRG 314, 315, 316, with relative weights from 0.6821 to 2.0852 depending on complications. Higher weights mean higher Medicare reimbursement.
Is I30.1 a CC or MCC?
CMS lists I30.1 as a CC (complication or comorbidity) for FY 2026. 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 16 closely related codes in its exclusion list.
What is the ICD-9 equivalent of I30.1?
Under the General Equivalence Mappings, infective pericarditis converts to ICD-9-CM 420.90 (acute pericarditis NOS). The mapping is approximate, so confirm the match fits the documentation.
