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Verify National Provider Identifier
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| function verifyNPI(npi) | |
| { | |
| if (!(/^[0-9]{10}$/.test(npi))) | |
| return null; | |
| var count = 0; | |
| for (i = 8; i >= 0; i--) | |
| { | |
| if (i % 2 == 0) | |
| { | |
| var tempNum = npi.charAt(i) * 2; | |
| if (tempNum >= 10) | |
| count += (tempNum % 10) + 1; | |
| else | |
| count += tempNum; | |
| } | |
| else | |
| { | |
| count += npi.charAt(i) * 1; | |
| } | |
| } | |
| var checkDigit = (1006 - count) % 10; | |
| return npi.charAt(9) == checkDigit; | |
| } | |
| /* | |
| usage: | |
| var result = verifyNPI("123457893"); | |
| document.body.innerText = result || "false"; | |
| */ |
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