diff --git a/index.js b/index.js
index 10e69b9..bcba7bc 100644
--- a/index.js
+++ b/index.js
@@ -141,14 +141,14 @@ function splitPostpaidDetail(str) {
     return retval;
 }
 
-function calculateBaseBillAmount(detailSpitted) {
+function calculateBaseBillAmount(detailSplitted) {
     const keywords = ['TAGIHAN', 'DENDA', 'RPPREMI'];
 
     let retval = 0;
-    let detailCount = (detailSpitted || []).length;
+    let detailCount = (detailSplitted || []).length;
 
     for (let i = 0; i < detailCount; i += 1) {
-        const item = detailSpitted[i];
+        const item = detailSplitted[i];
         if (keywords.indexOf(item.keyword.toUpperCase()) >= 0) {
             retval += Number(item.value) || 0;
         }
@@ -157,6 +157,11 @@ function calculateBaseBillAmount(detailSpitted) {
     return retval;
 }
 
+function getBillCount(msg) {
+    const matches = (msg || '').match(/JMLBLN:(\d+)BLN/);
+    return (matches && Number(matches[1])) || null;
+}
+
 exports.getRcFromMessage = getRcFromMessage;
 exports.getPriceFromMessage = getPriceFromMessage;
 exports.getSnFromMessage = getSnFromMessage;
@@ -167,3 +172,4 @@ exports.isPostpaidResponseMessage = isPostpaidResponseMessage;
 exports.getDetailFromMessage = getDetailFromMessage;
 exports.splitPostpaidDetail = splitPostpaidDetail;
 exports.calculateBaseBillAmount = calculateBaseBillAmount;
+exports.getBillCount = getBillCount;
diff --git a/test/main.js b/test/main.js
index 6f125a5..b53f5cb 100644
--- a/test/main.js
+++ b/test/main.js
@@ -130,5 +130,14 @@ describe('#irs', function() {
             irs.calculateBaseBillAmount(splitted).should.equal(140560);
 
         })
+    }); 
+
+    describe('#getBillCount', () => {
+        it('should return correct value', () => {
+            irs.getBillCount('0BNS25G5087744307740/NAMA:SUYATMAN/DAYA:900/TARIF:R1M/JMLBLN:2BLN/PERIODE:201911,201912/METERKINI:3606/METERLALU:3564/TAGIHAN:117260/ADM:5000/DENDA:9000/TOTALBAYAR:131260').should.equal(2);
+            should.not.exists(irs.getBillCount('0BNS25G5087744307740/NAMA:SUYATMAN/DAYA:900/TARIF:R1M/JMLBLN:BLN/PERIODE:201911,201912/METERKINI:3606/METERLALU:3564/TAGIHAN:117260/ADM:5000/DENDA:9000/TOTALBAYAR:131260'));
+            should.not.exists(irs.getBillCount(''));
+            should.not.exists(irs.getBillCount());
+        });
     });
 });
\ No newline at end of file