CMS 1500 Form: Completing Boxes 9C-11C – Patient Condition & Other Insured Details

The CMS 1500 form is the bedrock of medical claims submission for professional services, and mastering its intricacies is paramount for timely reimbursement. While many boxes seem straightforward, Boxes 9C through 11C often present significant challenges, particularly when dealing with complex patient conditions, accident-related injuries, and intricate Coordination of Benefits (COB) scenarios. Incorrectly completing these sections can lead to frustrating denials, delayed payments, and increased administrative burden. This comprehensive guide will meticulously break down each sub-box within this critical range, offering detailed instructions, real-world examples, payer-specific insights, and strategies to ensure your claims are clean, compliant, and ready for swift processing.

Quick Reference Guide

Navigating the nuances of the CMS 1500 form requires a quick grasp of key fields. The following table provides a concise overview of Boxes 9C-11C, highlighting their purpose and essential rules.

Box Number	Field Name	Purpose	Key Rules/Codes
9C	Other Insured’s FECA Claim No.	For Federal Employees’ Compensation Act (FECA) claims.	Enter the 9-digit FECA claim number. Required when FECA is primary.
10A	Is Patient’s Condition Related To: Employment? (Accident)	Indicates if the injury is work-related (Workers’ Compensation).	Mark ‘YES’ if applicable. Requires Workers’ Comp carrier info in Box 11.
10B	Is Patient’s Condition Related To: Auto Accident?	Indicates if the injury is due to a motor vehicle accident.	Mark ‘YES’ if applicable. Enter accident DATE (MMDDYYYY) and STATE abbreviation.
10C	Is Patient’s Condition Related To: Other Accident?	Indicates if the injury is due to any other type of accident (e.g., slip and fall).	Mark ‘YES’ if applicable. Enter accident DATE (MMDDYYYY).
11	Insured’s Policy Group or FECA Number	Policy number for the primary insured.	Enter the primary policy/group number. If FECA, enter claim number.
11A	Insured’s Date of Birth & Sex	Demographic information for the primary insured.	Enter DOB (MMDDYYYY) and ‘M’ or ‘F’.
11B	Other Claim ID (Designated by NUCC)	Used for specific claim identifiers, often for secondary claims.	Enter the payer’s claim number for the primary payer if billing secondary.
11C	Payer Name	Name of the primary insurance carrier.	Enter the full name of the primary insurance company.

Detailed Breakdown: Patient Condition & Other Insured Details

The sections from Box 9C through 11C are critical for establishing the patient’s insurance hierarchy, identifying the nature of their condition, and ensuring proper Coordination of Benefits (COB). Accurate completion here is vital for both primary and secondary claims.

Box 9: Other Insured’s Name (and Sub-Boxes)

This entire section (Boxes 9-9D) is dedicated to the “Other Insured” – meaning the policyholder of a secondary or tertiary insurance plan. It’s filled out when the patient has more than one insurance policy, and the claim is being submitted to the secondary payer.

Box 9C: Other Insured’s FECA Claim Number

Purpose: This box is specifically for claims under the Federal Employees’ Compensation Act (FECA). If the “Other Insured” (the secondary policyholder) is covered by FECA, their FECA claim number is entered here.

Instructions: Enter the 9-digit FECA claim number. This is crucial for federal employees who sustain work-related injuries or illnesses.

Payer-Specifics: FECA claims are processed by the Department of Labor. If FECA is primary, you would typically bill them first, and then use this box if another insurance is secondary to FECA. If FECA is secondary, you’d enter the primary payer’s information in Box 11 and the FECA details here.

Common Rejections: Claims may be rejected if the FECA number is missing, incorrect, or if the claim is submitted to the wrong payer hierarchy.

Box 10: Is Patient’s Condition Related To…

This section is paramount for identifying the cause of the patient’s condition, which directly impacts payer responsibility and liability. Incorrectly marking these boxes is a frequent cause of denials.

Box 10A: Employment? (Accident)

Purpose: To indicate if the patient’s injury or illness is work-related, falling under Workers’ Compensation.

Instructions: Mark ‘YES’ if the condition is due to an on-the-job injury or occupational disease. If ‘YES’ is marked, the Workers’ Compensation carrier’s information (policy number, name, etc.) must be entered in Box 11. Do NOT bill the patient’s regular health insurance if it’s a Workers’ Comp case, unless specifically instructed by the Workers’ Comp carrier or if the claim is denied by Workers’ Comp.

Payer-Specifics: Medicare and private payers will almost always deny claims marked ‘YES’ in 10A, expecting the Workers’ Comp carrier to be billed first. They will require a denial from Workers’ Comp before considering payment.

Common Rejections: CO-16 (Claim lacks information), PR-24 (Services not authorized).

Box 10B: Auto Accident?

Purpose: To indicate if the patient’s injury is a result of a motor vehicle accident.

Instructions: Mark ‘YES’ if applicable. If ‘YES’ is marked, you MUST enter the accident DATE (MMDDYYYY) and the two-letter STATE abbreviation where the accident occurred. This information is critical for identifying the responsible auto insurance carrier (e.g., Personal Injury Protection – PIP, Medical Payments – MedPay).

Payer-Specifics: Auto insurance (PIP/MedPay) is typically primary to health insurance for auto accident injuries. Medicare is generally secondary to auto insurance. Private payers will often deny claims if auto accident information is present but no auto insurance is billed first, or if the accident date/state is missing.

Common Rejections: M86 (Missing/incomplete/invalid accident date), CO-16 (Claim lacks information).

Box 10C: Other Accident?

Purpose: To indicate if the patient’s injury is due to any accident other than* employment or auto-related. This covers a broad range of scenarios where a third party might be liable.

Instructions: Mark ‘YES’ if applicable. If ‘YES’ is marked, you MUST enter the accident DATE (MMDDYYYY).

Detailed Examples for ‘Other Accident’ Scenarios:

Slip and Fall: A patient slips on a wet floor in a grocery store, breaking their wrist. Mark ‘YES’ in 10C and enter the date of the fall. The grocery store’s general liability insurance might be primary.

Product Liability: A patient is injured due to a defective product (e.g., a faulty appliance, a contaminated food item). Mark ‘YES’ in 10C and enter the date of injury. The product manufacturer’s liability insurance could be responsible.

Dog Bite: A patient is bitten by a neighbor’s dog. Mark ‘YES’ in 10C and enter the date of the incident. The dog owner’s homeowner’s insurance might be primary.

Sports Injury (Third-Party Liability): A patient is injured during an organized sports event due to negligence of the facility or another participant (e.g., faulty equipment, unsafe playing conditions). Mark ‘YES’ in 10C and enter the date. The facility’s or responsible party’s liability insurance may apply.

Medical Malpractice (Initial Claim): While often complex, if a patient is injured due to alleged medical negligence, the initial services related to treating that injury might be marked ‘YES’ in 10C with the date of the incident, pending a malpractice claim.

Payer-Specifics: Similar to auto accidents, health insurance (including Medicare) often expects other liability insurance to be billed first if a third party is responsible. Many private payers will deny claims marked ‘YES’ in 10C if they suspect another payer is primary, requiring documentation of the other payer’s denial or non-existence.

Common Rejections: CO-16 (Claim lacks information), M86 (Missing/incomplete/invalid accident date).

Box 11: Insured’s Policy Group or FECA Number (and Sub-Boxes)

This section identifies the primary insurance policyholder and their plan details. It’s crucial for establishing the correct payer for the claim.

Box 11: Insured’s Policy Group or FECA Number

Purpose: To enter the policy, group, or FECA number of the primary* insured.

Instructions: Enter the policy number of the primary insurance. If the primary insurance is Workers’ Compensation, enter the Workers’ Comp claim number. If FECA is primary, enter the FECA claim number.

Payer-Specifics: This is the most fundamental piece of information for the primary payer. Any error here will result in an immediate denial.

Common Rejections: A0 (Missing/incomplete/invalid subscriber/insured name), 16 (Claim lacks information).

Box 11A: Insured’s Date of Birth & Sex

Purpose: To provide demographic information for the primary insured.

Instructions: Enter the primary insured’s Date of Birth (MMDDYYYY) and mark ‘M’ for male or ‘F’ for female.

Payer-Specifics: This information is used by payers to verify eligibility and identify the correct policyholder. Discrepancies can lead to denials.

Common Rejections: 16 (Claim lacks information), A0 (Missing/incomplete/invalid subscriber/insured name).

Box 11B: Other Claim ID (Designated by NUCC)

Purpose: This box is used to enter a payer-assigned claim control number from a primary payer when submitting a claim to a secondary* payer. It helps the secondary payer identify the primary claim and process the secondary claim efficiently.

Instructions: If you are billing a secondary insurance, and the primary insurance has already processed the claim, enter the primary payer’s claim control number (found on the Explanation of Benefits/Remittance Advice) here.

Payer-Specifics: Many secondary payers, especially Medicare when it’s secondary, require the primary payer’s claim number in this box. Failure to include it will result in denials, as they cannot properly coordinate benefits without it.

Common Rejections: 16 (Claim lacks information), 29 (The time limit for filing has expired).

Box 11C: Payer Name

Purpose: To identify the name of the primary insurance carrier.

Instructions: Enter the full name of the primary insurance company.

Payer-Specifics: Ensure the name matches the payer’s official name exactly. Minor discrepancies can cause processing delays.

Common Rejections: 16 (Claim lacks information), A0 (Missing/incomplete/invalid subscriber/insured name).

Coordination of Benefits (COB) Rules and Their Application

Coordination of Benefits (COB) is the process by which health insurance companies determine which plan pays first when an individual is covered by more than one health insurance plan. The goal is to prevent duplicate payments and ensure that the total benefits paid do not exceed 100% of the allowable charges. Boxes 9-11C are central to this process.

Primary Payer Identification: Box 11 (and its sub-boxes 11A-C) is always for the primary* insurance. This is the plan that pays first.
Secondary Payer Identification: Boxes 9 (and its sub-boxes 9A-D) are for the secondary* insurance. This plan pays after the primary plan has processed the claim.

COB Rules in Action:

Birthday Rule: For children covered by both parents’ plans, the plan of the parent whose birthday falls earlier in the calendar year is usually primary.

Active vs. Retired: If a person has coverage through an active employer and a retired employer, the active employer’s plan is usually primary.

Medicare Secondary Payer (MSP) Rules: Medicare has specific rules for when it is primary or secondary. For example, if a patient is over 65 and still working, their employer group health plan (EGHP) may be primary, and Medicare secondary. If the patient has an auto accident, auto insurance is primary to Medicare. If the patient has a Workers’ Comp injury, Workers’ Comp is primary to Medicare.

No-Fault vs. At-Fault: In auto accidents, no-fault insurance (like PIP) is typically primary. If there’s an at-fault party, their liability insurance might come into play.

Impact on Boxes 9-11C:

When billing the primary* payer, Boxes 9-9D are left blank. Boxes 11-11C contain the primary insured’s details.
When billing the secondary* payer, Boxes 9-9D contain the primary insured’s details (as they are the “other insured” from the secondary payer’s perspective). Boxes 11-11C contain the secondary insured’s details. Crucially, Box 11B (Other Claim ID) should contain the primary payer’s claim number to facilitate COB.

Common COB Rejections: Denials often occur if the COB order is incorrect, if the primary payer’s EOB/RA is not attached (for paper claims) or its claim number is missing (for electronic claims in Box 11B), or if the accident information in Box 10 contradicts the COB rules.

Comprehensive Checklist for Reviewing Boxes 9C-11C

Before submitting any claim, especially those involving accidents or multiple payers, use this checklist:

• ☐ Box 9C (FECA): Is it filled only if FECA is the “Other Insured”? Is the 9-digit number accurate?
• ☐ Box 10A (Employment): Is ‘YES’ marked ONLY for Workers’ Comp? Is Box 11 correctly populated with Workers’ Comp info?
• ☐ Box 10B (Auto Accident): Is ‘YES’ marked for auto accidents? Is the MMDDYYYY accident date present? Is the 2-letter STATE abbreviation present?
• ☐ Box 10C (Other Accident): Is ‘YES’ marked for non-employment/non-auto accidents? Is the MMDDYYYY accident date present?
• ☐ Box 11 (Primary Policy): Is the correct primary policy/group/FECA number entered?
• ☐ Box 11A (Primary Insured DOB/Sex): Is the MMDDYYYY DOB accurate? Is ‘M’ or ‘F’ correctly marked?
• ☐ Box 11B (Other Claim ID): If billing secondary, is the primary payer’s claim control number entered here?
• ☐ Box 11C (Primary Payer Name): Is the primary payer’s name spelled correctly and completely?
• ☐ COB Logic: Does the information in Boxes 9 and 11 correctly reflect the primary/secondary payer hierarchy based on COB rules?
• ☐ Supporting Documentation: For accident claims, is all necessary documentation (e.g., accident reports, primary EOBs for secondary claims) ready if requested?

Real-World Billing Scenarios & Patient Status Changes

Understanding how to apply these rules in various situations is key to successful billing.

Scenario 1: Auto Accident with Personal Injury Protection (PIP)

Patient Status: Injured in a car accident, has auto insurance with PIP coverage.

Billing Action:

Box 10B: Mark ‘YES’. Enter accident date (MMDDYYYY) and state (e.g., ‘CA’).

Box 10A & 10C: Leave blank.

Box 11: Enter the auto insurance policy/claim number.

Box 11A: Enter the auto insured’s DOB and sex.

Box 11C: Enter the auto insurance carrier’s name (e.g., “GEICO PIP”).

Boxes 9-9D: Leave blank (unless there’s a secondary auto policy, which is rare).

Outcome: Claim submitted to auto insurance as primary.

Scenario 2: Slip and Fall at a Retail Store

Patient Status: Injured after slipping on a wet floor in a store, has personal health insurance.

Billing Action:

Box 10C: Mark ‘YES’. Enter accident date (MMDDYYYY).

Box 10A & 10B: Leave blank.

Box 11: Enter the patient’s personal health insurance policy number.

Box 11A: Enter the patient’s DOB and sex.

Box 11C: Enter the patient’s health insurance carrier’s name (e.g., “Blue Cross Blue Shield”).

Boxes 9-9D: Leave blank.

Outcome: Claim submitted to health insurance. The health insurance may process the claim but will likely send a subrogation questionnaire to determine if a third party (the store’s liability insurance) is responsible. Be prepared to provide information if requested.

Scenario 3: Workers’ Compensation Injury

Patient Status: Injured at work, has an approved Workers’ Comp claim.

Billing Action:

Box 10A: Mark ‘YES’.

Box 10B & 10C: Leave blank.

Box 11: Enter the Workers’ Comp claim number.

Box 11A: Enter the injured worker’s DOB and sex.

Box 11C: Enter the Workers’ Comp carrier’s name (e.g., “Liberty Mutual Workers’ Comp”).

Boxes 9-9D: Leave blank.

Outcome: Claim submitted directly to the Workers’ Comp carrier.

Scenario 4: Patient with Two Private Health Insurances (COB)

Patient Status: Covered by two private health plans (e.g., through two employers, or parent’s plan and own plan), Plan A is primary, Plan B is secondary.

Billing Action (Primary Claim to Plan A):

Boxes 9-9D: Leave blank.

Box 10A-C: Mark ‘NO’ or leave blank unless accident-related.

Box 11: Enter Plan A’s policy number.

Box 11A: Enter Plan A insured’s DOB and sex.

Box 11C: Enter Plan A’s name.

Billing Action (Secondary Claim to Plan B):

Box 9: Enter Plan A insured’s name.

Box 9A: Enter Plan A’s policy number.

Box 9D: Enter Plan A insured’s DOB and sex.

Box 10A-C: Mark ‘NO’ or leave blank unless accident-related (same as primary claim).

Box 11: Enter Plan B’s policy number.

Box 11A: Enter Plan B insured’s DOB and sex.

Box 11B: Enter Plan A’s claim control number (from the EOB/RA).

Box 11C: Enter Plan B’s name.

Outcome: Primary claim processed by Plan A, then secondary claim processed by Plan B, coordinating benefits.

Scenario 5: Medicare Secondary to Employer Group Health Plan (EGHP)

Patient Status: Over 65, still actively working, covered by employer’s health plan (EGHP) and Medicare. EGHP is primary.

Billing Action (Primary Claim to EGHP):

Boxes 9-9D: Leave blank.

Box 10A-C: Mark ‘NO’ or leave blank unless accident-related.

Box 11: Enter EGHP policy number.

Box 11A: Enter EGHP insured’s DOB and sex.

Box 11C: Enter EGHP name.

Billing Action (Secondary Claim to Medicare):

Box 9: Enter EGHP insured’s name.

Box 9A: Enter EGHP policy number.

Box 9D: Enter EGHP insured’s DOB and sex.

Box 10A-C: Mark ‘NO’ or leave blank unless accident-related (same as primary claim).

Box 11: Enter Medicare HICN/MBI.

Box 11A: Enter Medicare insured’s DOB and sex.

Box 11B: Enter EGHP’s claim control number (from the EOB/RA).

Box 11C: Enter “Medicare”.

Outcome: EGHP processes primary, then Medicare processes secondary, adhering to MSP rules.

Common Denial Codes & Step-by-Step Appeal Instructions

Denials related to Boxes 9C-11C are often due to missing or incorrect information, or improper COB application. Here are common denial codes and how to address them:

CARC CO-16: Claim Lacks Information or Has Incomplete Information

Meaning: This is a general denial code indicating that a required field is missing or incomplete. For Boxes 9C-11C, this often means a missing accident date, state, policy number, or payer name.

Appeal/Correction:

1. Review EOB/ERA: Carefully read the denial reason.
2. Examine Claim: Compare the submitted claim to the patient’s records. Check Boxes 9C-11C for any blank fields, typos, or incorrect dates/numbers.
3. Obtain Missing Info: If an accident date or policy number is missing, contact the patient or the primary payer.
4. Correct & Resubmit: Correct the claim with the accurate information. If it’s a simple correction, resubmit as a corrected claim (often with a “7” in Box 22 for resubmission code). If it’s a more complex issue, an appeal might be necessary with supporting documentation.

CARC M86: Missing/Incomplete/Invalid Accident Date

Meaning: Specifically indicates an issue with the accident date in Box 10B or 10C.

Appeal/Correction:

1. Review EOB/ERA: Confirm the denial specifically references the accident date.
2. Verify Date: Check the patient’s intake forms, medical records, and any accident reports for the correct MMDDYYYY accident date.
3. Correct & Resubmit: Update the claim with the accurate accident date. Resubmit as a corrected claim.

*CARC

External Resources & Authority Links

• For more detailed insights, refer to the official CMS Medicare guidelines.
• For more detailed insights, refer to the CMS guidelines.