Small Intestine (excluding Gastrointestinal Stromal Tumor and Neuroendocrine Tumor)

Primary Site Histology Staging Type
C170-C172, C178-C179 8000-8152, 8154-8231, 8243-8245, 8247-8248, 8250-8576, 8940-8950, 8980-8981 TNM 7 and Summary Stage
C170-C172, C178-C179 8577-8934, 8951-8979, 8982-9136, 9141-9582, 9700-9701 Summary Stage only
C173 8000-8152, 8154-8231, 8243-8245, 8247-8248, 8250-8934, 8940-9136, 9141-9582, 9700-9701 Summary Stage only

If you are working with a site/histology that only summary stages and you need to directly code it, please use the SEER Summary Stage 2000 manual

Notes

M-8000-8152,8154-8231,8243-8245,8247,8248,8250-8934,8940-9136,9141-9582,9700-9701 C170 Duodenum C171 Jejunum C172 Ileum (excluding ileocecal valve C18.0) C173 Meckel diverticulum (site of neoplasm) C178 Overlapping lesion of small intestine C179 Small intestine, NOS **Note 1:** This schema is based on the UICC chapter *Small Intestine,* pages 82-85. * Primary sites C173, C178, and C179 are listed in the chapter heading but are not specified in the anatomic subsites in this chapter of the UICC manual; however, they are included in this schema and TNM staged if appropriate histology criteria are met **Note 2:** In addition to directly assigning TNM, Summary Stage 2000 (SS2000) must be captured. If directly assigning SS2000, use the *Small Intestine* chapter on page 86 of the [SS2000 on-line manual](https://seer.cancer.gov/tools/ssm/ssm2000/SSSM2000-122012.pdf#page=86).

Main Data Items

Name Default Value Used for Staging NAACCR Item Required By Metadata
Clinical T <BLANK> Yes NAACCR #940 None
Clinical N <BLANK> Yes NAACCR #950 None
Clinical M <BLANK> Yes NAACCR #960 None
TNM Clin Stage Group 99 Yes NAACCR #970 None
Pathologic T <BLANK> Yes NAACCR #880 None
Pathologic N <BLANK> Yes NAACCR #890 None
Pathologic M <BLANK> Yes NAACCR #900 None
TNM Path Stage Group 99 Yes NAACCR #910 None
SSF1: Carcinoembryonic Antigen (CEA) 999 No NAACCR #2880 CCCR/Canada
COC
SEER		 None
SSF3: Carcinoembryonic Antigen (CEA) Lab Value 988 No NAACCR #2900 CCCR/Canada
COC		 None
SSF4: Crohn Disease 988 No NAACCR #2910 None None
SSF5: Microsatellite Instability 988 No NAACCR #2920 None None

Additional Data Items

Name Default Value Used for Staging NAACCR Item Required By Metadata
Year of Diagnosis <BLANK> No NAACCR #390 None
Primary Site <BLANK> Yes NAACCR #400 None
Histology <BLANK> Yes NAACCR #522 None
Behavior <BLANK> Yes NAACCR #523 None
RX Summ Systemic/Surgery Sequence <BLANK> Yes NAACCR #1639 None
RX Summ Surgery/Radiation Sequence <BLANK> Yes NAACCR #1380 None
Regional Nodes Positive <BLANK> Yes NAACCR #820 None

Initial Context

Staging Methods

Expand All | Collapse All

TNM 7 Stage

Inclusion Table

Primary Site Histology
C170, C171, C172, C178, C179 8000-8152
C170, C171, C172, C178, C179 8154-8231
C170, C171, C172, C178, C179 8243-8245
C170, C171, C172, C178, C179 8247
C170, C171, C172, C178, C179 8248
C170, C171, C172, C178, C179 8250-8576
C170, C171, C172, C178, C179 8940-8950
C170, C171, C172, C178, C179 8980-8981

Start

Additional Context
Pathologic Stage Group = 90
Clinical Stage Group = 90

Next Step

  2. Parse T
  3. clin_t_prefix
    tmp_clin_t

Next Step

  2. Parse N
  3. clin_n_prefix
    tmp_clin_n

Next Step

  2. Parse M
  3. tmp_clin_m
    clin_m_prefix

Next Step

  2. Parse T
  3. tmp_path_t
    path_t_prefix

Next Step

  2. Parse N
  3. tmp_path_n
    path_n_prefix

Next Step

  2. Parse M
  3. tmp_path_m
    path_m_prefix

Next Step

  2. Determine Default T
  3. Source T
    tmp_path_t
    tmp_clin_t
    tmp_combined_t

Next Step

  2. Determine Default N
  3. tmp_combined_n
    tmp_clin_n
    tmp_path_n
    Source N

Next Step

  2. Determine Default M
  3. tmp_path_m
    tmp_combined_m
    tmp_clin_m
    Source M

Next Step

  2. TNM 7 Stage Group
  3. Clinical Stage Group

Next Step

  2. TNM 7 Path Stage Group
  3. Pathologic Stage Group

Next Step

  2. Adjustments for No Clin or No Path
  3. tmp_combined_n
    tmp_combined_m
    Source T
    Clinical Stage Group
    Pathologic Stage Group
    Source N
    tmp_combined_t
    Source M

End

Combined Stage

Inclusion Table

Primary Site Histology
C170, C171, C172, C178, C179 8000-8152
C170, C171, C172, C178, C179 8154-8231
C170, C171, C172, C178, C179 8243-8245
C170, C171, C172, C178, C179 8247
C170, C171, C172, C178, C179 8248
C170, C171, C172, C178, C179 8250-8576
C170, C171, C172, C178, C179 8940-8950
C170, C171, C172, C178, C179 8980-8981

Start

Additional Context
Combined Stage Group = 90
Combined N = 90
Combined M = 90
Combined T = 90

Next Step

  2. Stop if No Clin and No Path
  3. Combined M
    Combined N
    Source T
    tmp_continue
    Combined T
    Combined Stage Group
    Source N
    Source M

Next Step

  2. Combined T
  3. Source T
    tmp_combined_t

Next Step

  2. Combined N for Tis Cancers
  3. tmp_combined_n
    Source N

Next Step

  2. Combined M
  3. tmp_combined_m
    tmp_source_m
    Source M

Next Step

  2. Determine Combined Prefix
  3. cmb_t_prefix

Next Step

  2. Determine Combined Prefix
  3. cmb_n_prefix

Next Step

  2. Determine Combined Prefix
  3. cmb_m_prefix

Next Step

  2. Concatenate T
  3. Combined T

Next Step

  2. Concatenate N
  3. Combined N

Next Step

  2. Concatenate M
  3. Combined M

Next Step

  2. TNM 7 Path Stage Group
  3. Combined Stage Group

End

Outputs

Name Default Value Description NAACCR Item Metadata
Derived Version {{ctx_alg_version}} None None
Derived SEER Clin Stage Group 88 NAACCR #3610
None 		None
Derived SEER Path Stage Group 88 NAACCR #3605
None 		None
Derived SEER Combined Stage Group 88 NAACCR #3614
None 		None
Derived SEER Combined T 88 NAACCR #3616
None 		None
Derived SEER Combined N 88 NAACCR #3618
None 		None
Derived SEER Combined M 88 NAACCR #3620
None 		None
Derived SEER Combined T Source <BLANK> NAACCR #3622
None 		None
Derived SEER Combined N Source <BLANK> NAACCR #3624
None 		None
Derived SEER Combined M Source <BLANK> NAACCR #3626
None 		None