DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

O11 Pre-existing hypertension with pre-eclampsia

  • Header · not billable

O11 is not billable. The category heads 6 billable codes in FY2027: the 6 codes directly below it.

Index → code

  • Hypertension, hypertensive (accelerated) (benign) (essential) (idiopathic) (malignant) (systemic)complicatingpregnancypre-existingwithpre-eclampsia → see category O11
  • Hypertension, hypertensive (accelerated) (benign) (essential) (idiopathic) (malignant) (systemic)complicatingchildbirth (labor)pre-existingwithpre-eclampsia → O11.4
  • Hypertension, hypertensive (accelerated) (benign) (essential) (idiopathic) (malignant) (systemic)complicatingpuerperium, pre-existingpre-existingwithpre-eclampsia → O11.5

Where it sits

  1. Chapter 15 Pregnancy, childbirth and the puerperium (O00-O9A)
  2. O10-O16 Edema, proteinuria and hypertensive disorders in pregnancy, childbirth and the puerperium (O10-O16)
  3. O11 Pre-existing hypertension with pre-eclampsia
Billable codes
6
Subdivisions
6
CC / MCC codes
0 / 3
HCC V28 codes
0
New FY2027
0
Index entries
3

Codes in O11

  1. O11.1
    Pre-existing hypertension with pre-eclampsia, first trimester
    BillableMCC
  2. O11.2
    Pre-existing hypertension with pre-eclampsia, second trimester
    BillableMCC
  3. O11.3
    Pre-existing hypertension with pre-eclampsia, third trimester
    BillableMCC
  4. O11.4
    Pre-existing hypertension with pre-eclampsia, complicating childbirth
    Billable
  5. O11.5
    Pre-existing hypertension with pre-eclampsia, complicating the puerperium
    Billable
  6. O11.9
    Pre-existing hypertension with pre-eclampsia, unspecified trimester
    Billable

CC/MCC: as a secondary diagnosis, unless the principal diagnosis is on the code’s PDX exclusion list (MS-DRG v44 Appendix C; list on the code card).

Sources of each column.

Instructions

At O11

Includes

  • conditions in O10 complicated by pre-eclampsia O10
  • pre-eclampsia superimposed pre-existing hypertension

Use additional code

  • code from O10 to identify the type of hypertension O10

Notes that also apply

Chapter 15 instructions (Notes 6, Excludes1 1, Excludes2 4, Use additional code 1): printed on the chapter 15 page.

Index entries

  • Hypertension, hypertensive (accelerated) (benign) (essential) (idiopathic) (malignant) (systemic)complicatingpregnancypre-existingwithpre-eclampsia → see category O11
  • Hypertension, hypertensive (accelerated) (benign) (essential) (idiopathic) (malignant) (systemic)complicatingchildbirth (labor)pre-existingwithpre-eclampsia → O11.4
  • Hypertension, hypertensive (accelerated) (benign) (essential) (idiopathic) (malignant) (systemic)complicatingpuerperium, pre-existingpre-existingwithpre-eclampsia → O11.5

NCHS Alphabetic Index. Index first, then the Tabular List.

Hierarchy