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O10 - Pre-existing hypertension complicating pregnancy, childbirth and the puerperium

ICD-10-CM Chapter 15: Pregnancy, childbirth and the puerperium · O10-O16 Edema, proteinuria and hypertensive disorders in pregnancy, childbirth and the puerperium (O10-O16) · Top-level category · FY2027

Coding Guidance

O10 is a non-billable heading. Report one of the 6 more specific codes below.

Includes, Excludes and Coding Notes

IncludesFrom O10

Conditions this code covers.

  • pre-existing hypertension with pre-existing proteinuria complicating pregnancy, childbirth and the puerperium
Excludes 2 — Not Included HereFrom O10

Not part of this code; report both codes when the patient has both conditions.

  • pre-existing hypertension with superimposed pre-eclampsia complicating pregnancy, childbirth and the puerperium (O11.-)
Excludes 1 — Not Coded HereFrom Chapter O00-O9A

Mutually exclusive: these conditions are never reported together with this code.

  • supervision of normal pregnancy (Z34.-)
Excludes 2 — Not Included HereFrom Chapter O00-O9A

Not part of this code; report both codes when the patient has both conditions.

  • mental and behavioral disorders associated with the puerperium (F53.-)
  • obstetrical tetanus (A34)
  • postpartum necrosis of pituitary gland (E23.0)
  • puerperal osteomalacia (M83.0)
Use Additional CodeFrom Chapter O00-O9A

Add a secondary code to identify the associated condition or cause when it is documented.

  • code, if applicable, from category Z3A, Weeks of gestation, to identify the specific week of the pregnancy, if known.
NotesFrom Chapter O00-O9A

Instructional notes from the ICD-10-CM tabular list.

  • CODES FROM THIS CHAPTER ARE FOR USE ONLY ON MATERNAL RECORDS, NEVER ON NEWBORN RECORDS
  • Codes from this chapter are for use for conditions related to or aggravated by the pregnancy, childbirth, or by the puerperium (maternal causes or obstetric causes)
  • Trimesters are counted from the first day of the last menstrual period. They are defined as follows:
  • 1st trimester- less than 14 weeks 0 days
  • 2nd trimester- 14 weeks 0 days to less than 28 weeks 0 days
  • 3rd trimester- 28 weeks 0 days until delivery

More Specific Codes (6)

O10.0Pre-existing essential hypertension complicating pregnancy, childbirth and the puerperium→O10.1Pre-existing hypertensive heart disease complicating pregnancy, childbirth and the puerperium→O10.2Pre-existing hypertensive chronic kidney disease complicating pregnancy, childbirth and the puerperium→O10.3Pre-existing hypertensive heart and chronic kidney disease complicating pregnancy, childbirth and the puerperium→O10.4Pre-existing secondary hypertension complicating pregnancy, childbirth and the puerperium→O10.9Unspecified pre-existing hypertension complicating pregnancy, childbirth and the puerperium→

Related condition guides

Documentation requirements, coding pitfalls and FAQs for conditions coded with O10.