# CARC 16 Denial Code (Claim/Service Lacks Information or Has Submission Error) | ANSI 835 EDI Spec
> Comprehensive healthcare EDI technical reference and denial resolution guide for Claim Adjustment Reason Code 16 (Claim/Service Lacks Information or Has Submission Error) under ANSI ASC X12 835 005010X221A1.

- **Canonical URL:** https://stanzaapi.com/tools/x12-parser/carc/carc-16-claim-lacks-information
- **Governing Standard:** ANSI ASC X12 Standards (005010) (Accredited Standards Committee X12 / HIPAA 5010)
- **Edge Latency SLA:** <2ms Edge (Cloudflare V8 Isolates)
- **Execution Model:** Pure compute $f(x) = y$, 100% In-Memory (Zero Store, Zero Log)

## Technical Overview & Governing Rules
Claim Adjustment Reason Code (CARC) 16 communicates: "Claim/service lacks information or has submission/billing error(s). At least one Remark Code must be provided.".

In ANSI X12 835 Electronic Remittance Advice (ERA) files, CARC 16 is reported in Loop 2110 (Service Payment Information) or Loop 2100 (Claim Payment Information) under the Claim Adjustment (CAS) segment with Group Code 'CO' (Contractual Obligation), formatted as: CAS*CO*16*AMOUNT~.

Root Cause: Missing or invalid data elements such as patient demographics, NPI, NDC number, medical record attachments, or required modifiers.

Adjudication & Appeal Strategy: Inspect accompanying RARC codes (e.g., M51, MA130), correct the missing data element on the original 837 claim, and submit as a corrected claim (CLM05-3=7).

## Specification Matrix
| Attribute | Value | Technical Guidance |
| --- | --- | --- |
| Reason Code | CARC 16 | Claim/Service Lacks Information or Has Submission Error |
| Standard Group Code | CO | Contractual Obligation |
| ANSI 835 Segment | CAS*CO*16*AMOUNT~ | Loop 2110 or Loop 2100 |
| Balance Billing Patient | Prohibited — this is an administrative claim defect. | Compliance with billing regulations |
| Common RARCs | M51, MA130, N257 | Remittance Advice Remark Codes |
| Recommended Action | Inspect accompanying RARC codes (e.g., M51, MA130), correct the missing data element on the original 837 claim, and submit as a corrected claim (CLM05-3=7). | Workflow for billing teams |

## Standard JSON Response Model
```json
{
  "transactionType": "835",
  "claimNumber": "CLM-2026-001",
  "adjudication": {
    "billedAmount": 500,
    "paidAmount": 0,
    "adjustments": [
      {
        "groupCode": "CO",
        "groupName": "Contractual Obligation",
        "reasonCode": "16",
        "reasonDescription": "Claim/Service Lacks Information or Has Submission Error",
        "adjustmentAmount": 500
      }
    ]
  }
}
```

## Frequently Asked Questions & Edge Cases
### Q: What does CARC 16 mean on an 835 ERA?
**A:** CARC 16 signifies: "Claim/service lacks information or has submission/billing error(s). At least one Remark Code must be provided.". It explains why the payer did not pay the full billed charge.

### Q: Can a provider balance-bill the patient for CARC 16?
**A:** Prohibited — this is an administrative claim defect.

### Q: How do medical billing teams resolve and appeal CARC 16?
**A:** Inspect accompanying RARC codes (e.g., M51, MA130), correct the missing data element on the original 837 claim, and submit as a corrected claim (CLM05-3=7).