S31.657A: Open bite of abdominal wall, left flank with penetration into peritoneal cavity, initial encounter

S31.657A, open bite of abdominal wall, left flank with penetration into peritoneal cavity, initial encounter, is listed as a covered diagnosis in 4 Medicare billing and coding articles that apply to 16 HCPCS Level II codes, including G0281 (Electrical stimulation, (unattended), to one or more…), G0329 (Electromagnetic therapy, to one or more areas for chronic…), G0283 (Electrical stimulation (unattended), to one or more areas…). The articles come from 2 Medicare contractors. A listed diagnosis supports medical necessity only; coverage still depends on the LCD's criteria and on documentation in the medical record.

HCPCS Level II codes with S31.657A as a covered diagnosis

CodeDescriptionMedicare coverageDMEPOS fee 2026 (state range)Articles listing it
G0281Electrical stimulation, (unattended), to one or more areas, for chronic stage iii and stage iv pressure ulcers, arterial ulcers, diabetic ulcers, and venous stasis ulcers not demonstrating measurable signs of healing after 30 days of conventional care, as part of a therapy plan of careCarrier judgment—2
G0329Electromagnetic therapy, to one or more areas for chronic stage iii and stage iv pressure ulcers, arterial ulcers, diabetic ulcers and venous stasis ulcers not demonstrating measurable signs of healing after 30 days of conventional care as part of a therapy plan of careCarrier judgment—2
G0283Electrical stimulation (unattended), to one or more areas for indication(s) other than wound care, as part of a therapy plan of careCarrier judgment—2
G0008Administration of influenza virus vaccineCarrier judgment—1
G0009Administration of pneumococcal vaccineCarrier judgment—1
G0010Administration of hepatitis b vaccineCarrier judgment—1
Q2038Influenza virus vaccine, split virus, when administered to individuals 3 years of age and older, for intramuscular use (fluzone)Special coverage instructions apply—1
Q2035Influenza virus vaccine, split virus, when administered to individuals 3 years of age and older, for intramuscular use (afluria)Special coverage instructions apply—1
Q2037Influenza virus vaccine, split virus, when administered to individuals 3 years of age and older, for intramuscular use (fluvirin)Special coverage instructions apply—1
Q2034Influenza virus vaccine, split virus, for intramuscular use (agriflu)Special coverage instructions apply—1
Q2036Influenza virus vaccine, split virus, when administered to individuals 3 years of age and older, for intramuscular use (flulaval)Special coverage instructions apply—1
Q2039Influenza virus vaccine, not otherwise specifiedSpecial coverage instructions apply—1
G0152Services performed by a qualified occupational therapist in the home health or hospice setting, each 15 minutesCarrier judgment—1
G0158Services performed by a qualified occupational therapist assistant in the home health or hospice setting, each 15 minutesCarrier judgment—1
G0160Services performed by a qualified occupational therapist, in the home health setting, in the establishment or delivery of a safe and effective occupational therapy maintenance program, each 15 minutesCarrier judgment—1
G2169Services performed by an occupational therapist assistant in the home health setting in the delivery of a safe and effective occupational therapy maintenance program, each 15 minutesCarrier judgment—1

Medicare policy articles listing S31.657A

A diagnosis listed as covered in a billing and coding article supports medical necessity for the article's codes; it does not guarantee payment. Coverage depends on the LCD's criteria, the contractor's jurisdiction and documentation in the medical record.

Other S31 diagnoses (Open wound of abdomen, lower back, pelvis and external genitals)

Frequently asked questions

Does Medicare cover S31.657A (Open bite of abdominal wall, left flank with penetration…)?

Medicare covers items and services, not diagnoses. 4 Medicare billing and coding articles list S31.657A as a covered diagnosis for 16 HCPCS Level II codes: the diagnosis can support medical necessity for those codes, but payment still depends on the LCD's coverage criteria and the medical record.

Which HCPCS codes can be billed with ICD-10 S31.657A?

The Level II codes from the policies most specific to this diagnosis are G0281 (Electrical stimulation, (unattended), to one or more…, 2 articles); G0329 (Electromagnetic therapy, to one or more areas for chronic…, 2 articles); G0283 (Electrical stimulation (unattended), to one or more areas…, 2 articles); G0008 (Administration of influenza virus vaccine, 1 article); G0009 (Administration of pneumococcal vaccine, 1 article). Code choice depends on the item supplied; check each code's descriptor.

Which Medicare policy articles list S31.657A?

A55909 (Billing and Coding: Wound Care); A54767 (Billing and Coding: Medicare Preventive Coverage for Certain Vaccines); A53057 (Billing and Coding: Home Health Occupational Therapy), and 1 more article.

What is ICD-10-CM code S31.657A?

S31.657A is the ICD-10-CM code for open bite of abdominal wall, left flank with penetration into peritoneal cavity, initial encounter, in category S31 (Open wound of abdomen, lower back, pelvis and external genitals), chapter 19: Injury, poisoning and other consequences of external causes.

Next steps

Sources: CMS Medicare Coverage Database billing and coding articles (covered ICD-10 code lists and HCPCS links); ICD-10-CM FY2026; CMS HCPCS Level II release October 2026; CMS DMEPOS fee schedule 2026 (non-rural state fees). Not billing or legal advice.

Chapter 19: Injury, poisoning and other consequences of external causes · All diagnoses · HCPCS lookup