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Alphabetic Index and Tabular path
HCC Buddy public API, FY2026 Apr updateSource load source requiredSource year 2026Updated 2026-04-01

Index trail

Secondary and unspecified malignant neoplasm of intrathoracic lymph nodes

See Tabular List: C77.1

C77, Secondary and unspecified malignant neoplasm of lymph nodes

C77.1, Secondary and unspecified malignant neoplasm of intrathoracic lymph nodes

Selected code, source checked for the selected effective period

Commonly confused codes

official source

Not listed for this effective period.

Code details and official notes

C77.1

Secondary and unspecified malignant neoplasm of intrathoracic lymph nodes

Open the shareable code page for C77.1→
billableHCC mapped

Includes

official source

Not listed for this effective period.

Excludes 1

official source
  • malignant neoplasm of lymph nodes, specified as primary (C81-C86, C88, C96.-)
  • mesentery metastasis of carcinoid tumor (C7B.04)
  • secondary carcinoid tumors of distant lymph nodes (C7B.01)

Excludes 2

official source

No Excludes 2 note is listed in this source payload.

Code First

official source

Not listed for this effective period.

Use Additional

official source

Not listed for this effective period.

Code Also

official source

Not listed for this effective period.

7th character

official source

Not listed for this code in the selected Tabular payload.

Placeholder X

official source

Not listed for this code in the selected Tabular payload.

Laterality

official source

No laterality instruction is listed for this code in the selected Tabular payload.

Effective period

source required
  • FY2026 Apr update
  • Source year 2026
  • Updated 2026-04-01
  • HCC Buddy public API
HCC Buddy
HCC Buddy
Alphabetic Index and Tabular path
HCC Buddy public API, FY2026 Apr updateSource load source requiredSource year 2026Updated 2026-04-01

Index trail

Secondary and unspecified malignant neoplasm of intrathoracic lymph nodes

See Tabular List: C77.1

C77, Secondary and unspecified malignant neoplasm of lymph nodes

C77.1, Secondary and unspecified malignant neoplasm of intrathoracic lymph nodes

Selected code, source checked for the selected effective period

Commonly confused codes

official source

Not listed for this effective period.

Code details and official notes

C77.1

Secondary and unspecified malignant neoplasm of intrathoracic lymph nodes

Open the shareable code page for C77.1→
billableHCC mapped

Includes

official source

Not listed for this effective period.

Excludes 1

official source
  • malignant neoplasm of lymph nodes, specified as primary (C81-C86, C88, C96.-)
  • mesentery metastasis of carcinoid tumor (C7B.04)
  • secondary carcinoid tumors of distant lymph nodes (C7B.01)

Excludes 2

official source

No Excludes 2 note is listed in this source payload.

Code First

official source

Not listed for this effective period.

Use Additional

official source

Not listed for this effective period.

Code Also

official source

Not listed for this effective period.

7th character

official source

Not listed for this code in the selected Tabular payload.

Placeholder X

official source

Not listed for this code in the selected Tabular payload.

Laterality

official source

No laterality instruction is listed for this code in the selected Tabular payload.

Effective period

source required
  • FY2026 Apr update
  • Source year 2026
  • Updated 2026-04-01
  • HCC Buddy public API
HCC Buddy Insights

HCC Mapping

HCC 17 Cancer Metastatic to Lung, Liver, Brain, and Other Organs; Acute Myeloid Leukemia Except Promyelocytic (V28)HCC 8 Metastatic Cancer and Acute Leukemia (V24)HCC 20 Cancer, Liver and Intrahepatic Bile Duct (RxHCC)HCC 8 Metastatic Cancer and Acute Leukemia (ESRD/PACE)HCC 8 HHS-HCC 8; HHS-HCC 2026 benefit year (HHS-HCC)

RAF Value

V28: RAF: 4.209V24: RAF: 2.659RxHCC: RAF: 0.491ESRD/PACE: RAF: 0.353HHS-HCC: RAF: Varies by metal level

Model Period

FY2026 Apr update

Source

source required

Audit Caution

Close codes need documentation support before selection. Do not assume relationships.
Reviewed by the HCC Buddy Coding Team

HCC Buddy workflow band

HCC mapping, RAF, MEAT, source trail, and audit caution stay in view.

MEAT supportaudit cautionsource required

V28

HCC 17

Cancer Metastatic to Lung, Liver, Brain, and Other Organs; Acute Myeloid Leukemia Except Promyelocytic

RAF: 4.209

V24

HCC 8

Metastatic Cancer and Acute Leukemia

RAF: 2.659

RxHCC

RxHCC 20

Cancer, Liver and Intrahepatic Bile Duct

RAF: 0.491

ESRD/PACE

HCC 8

Metastatic Cancer and Acute Leukemia

RAF: 0.353

HHS-HCC

HCC 8

HHS-HCC 8; HHS-HCC 2026 benefit year

RAF: Varies by metal level

MEAT checklist

Reviewed by the HCC Buddy Coding Team

Monitor, Evaluate, Assess, or Treat must be supported in the provider note.

HCC Buddy guidance, not official ICD-10-CM text.

Audit caution

Reviewed by the HCC Buddy Coding Team

Close codes need documentation support before selection. Do not assume relationships.

HCC Buddy guidance, not official ICD-10-CM text.

Reviewer sign-off

Reviewed by the HCC Buddy Coding Team

MEAT, documentation support, audit cautions, and close-code guidance are reviewed and approved for this effective period.

HCC Buddy enrichment is separate from official source text.

Last updated: April 1, 2026 · Not a substitute for official coding guidelines. No PHI or patient data.
HCC Buddy Code Card
FY 2026 Apr update
C77.1Billable

Secondary and unspecified malignant neoplasm of intrathoracic lymph nodes

CMS-HCC V28

HCC 17

RAF 4.209

CMS-HCC V24

HCC 8

RAF 2.659

RxHCC

RxHCC 20

RAF 0.491

Reviewed by the HCC Buddy Coding TeamFY2026 Apr update

Code

C77.1

V28 HCC

HCC 17

RAF

4.209

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