DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

C56 Malignant neoplasm of ovary

  • Header · not billable

C56 is not billable. The category heads 4 billable codes in FY2027: the 4 codes directly below it.

Index → code

  • Cancerovarian → C56.9-
  • Thecomamalignant → C56-
  • Carcinoma (malignant)theca cell → C56.-

Where it sits

  1. Chapter 2 Neoplasms (C00-D49)
  2. C51-C58 Malignant neoplasms of female genital organs (C51-C58)
  3. C56 Malignant neoplasm of ovary
Billable codes
4
Subdivisions
4
CC / MCC codes
4 / 0
HCC V28 codes
4
New FY2027
0
Index entries
74

Codes in C56

  1. C56.1
    Malignant neoplasm of right ovary
    BillableCC22
  2. C56.2
    Malignant neoplasm of left ovary
    BillableCC22
  3. C56.3
    Malignant neoplasm of bilateral ovaries
    BillableCC22
  4. C56.9
    Malignant neoplasm of unspecified ovary
    BillableCC22

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 C56

Use additional code

  • code to identify any functional activity

Notes that also apply

Block C51-C58 instructions (Includes 1): printed on the block page.

Chapter 2 instructions (Notes 8): printed on the chapter 2 page.

Index entries

  • Carcinoma (malignant)granulosa cell → C56-
  • Carcinoma (malignant)theca cell → C56.-
  • Dermoid (cyst)with malignant transformation → C56-
  • Thecomamalignant → C56-
  • Cancerovarian → C56.9-
  • Adenofibromaendometrioidmalignant → C56-
  • Brennertumor (benign)malignant → C56
  • Cyst (colloid) (mucous) (simple) (retention)dermoidwith malignant transformation → C56.-
  • Cystadenofibromaendometrioidmalignant → C56.-
  • Teratoma (solid)ovaryembryonal, immature or malignant → C56-
  • TumorBrennermalignant → C56-
  • Tumordermoidwith malignant transformation → C56-
  • Tumorgranulosa cellmalignant → C56-
  • Tumorgranulosa cell-theca cellmalignant → C56-
  • Tumorpapillarymucinous of low malignant potential → C56-
  • Adenocarcinomapapillocysticunspecified site → C56.9
  • Adenocarcinomapseudomucinousunspecified site → C56.9
  • Carcinoma (malignant)papillocysticunspecified site → C56.9
  • Carcinoma (malignant)pseudomucinousunspecified site → C56.9
  • Cystadenocarcinomamucinousunspecified site → C56.9
  • Cystadenocarcinomapapillaryunspecified site → C56.9
  • Cystadenocarcinomapseudomucinousunspecified site → C56.9
  • Cystadenocarcinomaserousunspecified site → C56.9
  • Dysgerminomaunspecified sitefemale → C56.9
  • Tumormucinous of low malignant potentialunspecified site → C56.9
  • Tumorserous of low malignant potentialunspecified site → C56.9
  • Cystadenomamucinousborderline malignancyovary → C56.-
  • Cystadenomapapillaryborderline malignancyovary → C56.-
  • Cystadenomapseudomucinousborderline malignancyovary → C56.-
  • Cystadenomaserousborderline malignancyovary → C56.-
  • Tumorendodermal sinusunspecified sitefemale → C56.-
  • Adenocarcinomaductunspecified sitefemale → C56.9
  • Adenocarcinomapapillaryserousunspecified site → C56.9
  • Adenocarcinomaserouspapillaryunspecified site → C56.9
  • Androblastomamalignantunspecified sitefemale → C56.9
  • Arrhenoblastomamalignantunspecified sitefemale → C56.9
  • Carcinoma (malignant)endometrioidunspecified sitefemale → C56.9
  • Carcinoma (malignant)Leydig cell (testis)unspecified sitefemale → C56.9
  • Carcinoma (malignant)papillaryserousunspecified site → C56.9
  • Carcinoma (malignant)serouspapillaryunspecified site → C56.9

34 more, longer entries are not listed; the search box finds them by word.

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

Hierarchy