Surgical Site Infection ICD-10-CM Codes

Explore ICD-10-CM codes for surgical site infections, including superficial, deep incisional, and device-related postprocedural complications.

By Wynona Jugueta on Aug 8, 2025.

Fact Checked by Gale Alagos.

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What are Surgical Site Infection ICD-10-CM Codes?

Surgical site infections (SSIs) are classified under specific ICD-10-CM codes that capture the depth, location, cause, and type of postprocedural complications. These codes help healthcare professionals document and bill for infections that occur following a procedure, whether they involve the superficial incisional surgical site, deeper tissue layers, or even internal organs.

Here are commonly used and billable surgical site infection ICD-10-CM codes:

T81.42 – Infection following a procedure, deep incisional surgical site, initial encounter: This code represents deep incisional SSIs, which penetrate beyond the skin into the subcutaneous tissue, fascia, or muscle layers. These often require antibiotics, drainage, and follow-up surgical and medical care.
T81.43 – Infection following a procedure, organ and space surgical site, initial encounter: Used when infections occur in organs or body cavities affected during surgery. These infections can lead to complications involving specific body systems or transplanted organs, requiring specialized intervention.
T81.44 – Sepsis following a procedure, initial encounter: Indicates systemic infection following surgery. It is one of the most serious postprocedural complications, often requiring ICU admission and immediate treatment to prevent organ failure.
T81.49 – Infection following a procedure, other surgical site, initial encounter: This catch-all code accounts for infections that don’t fall into the more specific categories, including procedure other surgical site complications.
T81.50 – Foreign body accidentally left in body following a procedure, initial encounter: This code addresses foreign body complications post-surgery, which may result in surgical site infections, abscess formation, and prosthetic devices implants failure.
T81.51 – Infection due to prosthetic devices, implants, and grafts, initial encounter: Used when an infection following a procedure is traced back to a contaminated implant, graft, or medical device.

Which Surgical Site Infection ICD-10-CM Codes are billable?

Yes, all the ICD-10-CM codes listed above are billable and can be reported for surgical site infections, depending on whether the issue involves superficial, deep incisional, organ/space, or device-related complications. Accurate coding is essential to reflect the specified complications and support appropriate reimbursement.

Clinical information

A surgical site infection (SSI) is an infection that occurs after surgery in the part of the body where the procedure took place. These infections are a type of postprocedural complication and may arise during initial healing or due to underlying factors like prosthetic devices, drugs and medicaments, or poor wound management.

SSIs are categorized into:

Superficial incisional SSIs: Affect only the skin and subcutaneous tissue. These may present as localized swelling, redness, or pus and can be caused by poor hygiene or bacterial exposure during the operation.
Deep incisional SSIs: Extend into muscle and fascia and often include signs like fever, abscess, and wound dehiscence. Deep infections may lead to subcutaneous abscess or require intervention for a procedure stitch abscess.
Organ/space SSIs: Involve internal organs or cavities exposed during an internal operation, including the retroperitoneal space. This includes conditions such as postprocedural retroperitoneal abscess.

Causative agents often include Staphylococcus aureus, Enterococcus, and other pathogens. In some cases, the infectious agent is not identified, which is why ICD codes may include a note to identify an infectious agent or use an additional code for clarification.

Risk factors and associated conditions

The development of an SSI can be influenced by:

Length and complexity of the surgery
Patient comorbidities (e.g., diabetes, obesity)
Immune status
Improper surgical technique or sterilization
Use of infusion transfusion and therapeutic injections, which may introduce contaminants

Other related ICD-10-CM codes include:

Obstetric surgical wound infection: Infection after obstetric surgery, particularly involving the genital tract, is documented under different codes depending on the trimester, infection type, and whether it’s an initial or subsequent encounter.
Ostomy complications, floppy iris syndrome, plateau iris syndrome, and endosseous dental implant failure are other specified complications classified elsewhere that may also require special attention.

Documentation and coding notes

Use fifth or sixth character extensions to indicate initial, subsequent, or sequelae encounters.
Use additional codes to identify the infectious agent, drug, or external cause, particularly in poisoning and toxic effects cases.
SSIs may be coded in conjunction with complications following infusion, transfusion, and therapeutic injection, toxic effects of drugs, or procedures not elsewhere classified.
For non-specific documentation, codes may reflect an unspecified surgical site, but precise descriptions are recommended to ensure billing accuracy and effective surgical and medical care delivery.

Synonyms include

Wound infection
Postoperative infection
Incisional infection
Iatrogenic infection
Hospital-acquired infection
Healthcare-associated infection
Nosocomial infection

Commonly asked questions

A Surgical Site Infection ICD-10-CM code should be used when an infection is documented to have developed at or near the site of a recent surgical procedure. This includes superficial, deep incisional, or organ/space infections following a procedure, especially when clinical signs like redness, discharge, fever, or swelling are present.

Treatments for surgical site infections (SSIs) typically include targeted antibiotics, wound cleaning, and, in more severe cases, surgical drainage or removal of prosthetic devices or implants. The specific therapy depends on the depth of infection and whether the infectious agent or foreign body is identified.

A diagnosis code for surgical site infection signifies that a patient has developed an infection directly linked to a recent surgical procedure. These ICD-10-CM codes help classify the infection type, location, severity, and any involvement of devices or grafts.

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