O10.21 – Pre-existing hypertensive chronic kidney disease complicating pregnancy

ICD-10-CM 2027 diagnosis code · Edema, proteinuria and hypertensive disorders in pregnancy, childbirth and the puerperium

Non-billable header

ICD-10-CM code O10.21

Code: O10.21 (claims format: O1021)
Description: Pre-existing hypertensive chronic kidney disease complicating pregnancy
Short description: Pre-existing hyp chronic kidney disease comp pregnancy
Billable: No – use a more specific code below
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 15. Pregnancy, childbirth and the puerperium (O00-O9A)
Block: O10-O16 Edema, proteinuria and hypertensive disorders in pregnancy, childbirth and the puerperium
Parent codes: O10 › O10.2

Billable codes under O10.21

O10.21 is a header code and cannot be used on claims. Choose the most specific code:

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

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

Includes:

pre-existing hypertension with pre-existing proteinuria complicating pregnancy, childbirth and the puerperium

Excludes2 (not included here):

pre-existing hypertension with superimposed pre-eclampsia complicating pregnancy, childbirth and the puerperium (O11.-)

O10.2 – Pre-existing hypertensive chronic kidney disease complicating pregnancy, childbirth and the puerperium

Applicable to:

Any condition in I12 specified as a reason for obstetric care during pregnancy, childbirth or the puerperium

Use additional code:

code from I12 to identify the type of hypertensive chronic kidney disease

Index terms for O10.21

Entries in the ICD-10-CM alphabetic index that lead to this code:

Hypertension, hypertensive, complicating, pregnancy, pre-existing, with, renal disease

Related codes in O10.2

Frequently asked questions

What is ICD-10 code O10.21?

O10.21 is the ICD-10-CM code for pre-existing hypertensive chronic kidney disease complicating pregnancy, in the block O10-O16 (Edema, proteinuria and hypertensive disorders in pregnancy, childbirth and the puerperium).

Is O10.21 a billable code?

No. O10.21 is a header code with more specific child codes; report one of the billable codes listed above.

What category does O10.21 belong to?

It belongs to category O10 – Pre-existing hypertension complicating pregnancy, childbirth and the puerperium.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.