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
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 |
