Carbohydrate Antigen 19-9 Pretreatment Lab Value

Description

Carbohydrate Antigen (CA) 19-9 Pretreatment Lab Value records the CA 19-9 value prior to treatment. CA 19-9 is a tumor marker that has prognostic significance for pancreatic cancer. CA 19-9 is a sialylated Lewis A blood group antigen that is commonly expressed and shed in pancreatic and hepatobiliary disease and in many malignancies, thus is not tumor specific. Preoperative CA 19-9 levels in pancreatic cancer patients correlate both with AJCC staging and resectability [NCCN Guidelines Version 3.2019 Pancreatic Adenocarcinoma].

Rationale

CA 19-9 Pretreatment Lab Value is a strong predictor of resectability in the absence of metastatic disease. It is a new data item for cases diagnosed 1/1/2021+.

Additional Info

**Source documents:** clinical laboratory report **Other names include** Carbohydrate Antigen 19-9, Cancer Antigen-GI, CA-GI, Cancer Antigen 19-9

Notes

**Note 1:** **Effective years** * This SSDI is effective for diagnosis years 2021+ * For cases diagnosed 2018-2020, this SSDI must be blank **Note 2:** **Physician Statement** * Physician statement of CA 19-9 (Carbohydrate Antigen 19-9) Pretreatment Lab Value can be used to code this data item when no other information is available.

Coding Guidelines

**1:** Record to the nearest tenth in Units/milliliter (U/ml), the highest CA 19-9 lab value documented in the medical record prior to treatment. * **a.** ***Example 1***: Code a pretreatment CA 19-9 of 7 U/ml as 7.0 * **b.** ***Example 2***: Code a pretreatment CA 19-9 of 1672.3 U/ml as 1672.3 **2.** Record 0.1 when the lab results are stated as less than 0.1 U/ml with no exact value. **3:** A known lab value takes priority over codes XXXX.2 and XXXX.3 * **a.** The lab value takes priority even if the physician documents the interpretation * **i.** ***Example:*** Patient noted to have a CA 19-9 of 3,219. Physician notes that the value is elevated * **ii** Code 3219.0 instead of XXXX.3 (elevated)

Default

XXXX.8

NAACCR Item

NAACCR #3942

Metadata

SSDI 2021–
Code Description
0.0 0.0 Units/milliliter (U/ml) exactly
0.1-9999.9 0.1-9999.9 U/ml (Exact value to nearest tenth in U/ml)
XXXX.1 10,000 U/ml or greater
XXXX.2 Lab value not available, physician states CA 19-9 is negative/normal
XXXX.3 Lab value not available, physician states CA 19-9 is positive/elevated/high
XXXX.7 Test ordered, results not in chart
XXXX.8 Not applicable: Information not collected for this case (If this information is required by your standard setter, use of code XXXX.8 may result in an edit error.)
XXXX.9 Not documented in medical record CA (Carbohydrate Antigen) 19-9 Pretreatment Lab Value not assessed or unknown if assessed
<BLANK> Must be blank if diagnosis year is before 2021