ICD-10-CM
ICD-10 code for Pyrexia (of unknown origin) puerperal: O86.4
The ICD-10-CM index points "Pyrexia (of unknown origin) puerperal" to O86.4, Pyrexia of unknown origin following delivery. O86.4 is a billable code.
Source: CDC ICD-10-CM FY2027 Alphabetic Index file dated June 16, 2026. Publisher page
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More specific codes in O86
A header groups codes and is not billed. A billable code is one you can report.
- O86Other puerperal infectionsHeader
- O86.0Infection of obstetric surgical woundHeader
- O86.00Infection of obstetric surgical wound, unspecifiedBillable
- O86.01Infection of obstetric surgical wound, superficial incisional siteBillable
- O86.02Infection of obstetric surgical wound, deep incisional siteBillable
- O86.03Infection of obstetric surgical wound, organ and space siteBillable
- O86.04Sepsis following an obstetrical procedureBillable
- O86.09Infection of obstetric surgical wound, other surgical siteBillable
- O86.1Other infection of genital tract following deliveryHeader
- O86.11Cervicitis following deliveryBillable
- O86.12Endometritis following deliveryBillable
- O86.13Vaginitis following deliveryBillable
- O86.19Other infection of genital tract following deliveryBillable
- O86.2Urinary tract infection following deliveryHeader
- O86.20Urinary tract infection following delivery, unspecifiedBillable
- O86.21Infection of kidney following deliveryBillable
- O86.22Infection of bladder following deliveryBillable
- O86.29Other urinary tract infection following deliveryBillable
- O86.4Pyrexia of unknown origin following deliveryBillable
- O86.8Other specified puerperal infectionsHeader
- O86.81Puerperal septic thrombophlebitisBillable
- O86.89Other specified puerperal infectionsBillable
Use additional code
The CDC tabular list says to add the code named here after this one when it applies.
From O86. A note on a category applies to every code under it.
Use additional code (B95-B97), to identify infectious agent
Excludes2
Excludes2 means the other condition can be reported with this one when both are documented.
From O86. A note on a category applies to every code under it.
Related pages
- O86.4 code detailsNotes, nearby codes, CMS-HCC group
- Category O86Every code under it
- Chapter 15Pregnancy, childbirth and the puerperium
- ICD-10 codes by conditionA to Z
- Check a list of ICD-10 codes
- Denial code CO-11Diagnosis does not support the procedure
- Denial code CO-146Diagnosis invalid for the date of service
- HCPCS Level II code lookup
Questions
What is the ICD-10 code for Pyrexia (of unknown origin) puerperal?
The ICD-10-CM index points "Pyrexia (of unknown origin) puerperal" to O86.4, Pyrexia of unknown origin following delivery. O86.4 is a billable code.
Is O86.4 billable?
Yes. O86.4 is a billable code in the FY2027 ICD-10-CM file. Use a more specific code when the record documents one.
What documentation notes apply to O86.4?
The CDC tabular list gives 3 Excludes2 notes (may be coded together when both are documented), 1 "use additional code" note for O86.4 and the categories above it. They are listed on this page.
What chapter is O86.4 in?
Chapter 15. Pregnancy, childbirth and the puerperium.
When do ICD-10-CM codes change?
Every October 1, with the new fiscal year file. Some years add April 1 updates. This page uses the FY2027 file, effective October 1, 2026.