CMS-1500 Form: A Comprehensive Guide to Boxes 9c, 10, and 11 (MSP, Condition Codes, & FECA Number)

Last Updated: July 6, 2026

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CMS-1500 Form: A Comprehensive Guide to Boxes 9c, 10, and 11 (MSP, Condition Codes, & FECA Number)

Navigating the intricacies of the CMS-1500 form boxes 9c, 10, and 11 is paramount for any medical billing professional aiming for clean claims and optimal reimbursement. These specific fields, often overlooked or misunderstood, hold the key to correctly identifying payer responsibility, communicating special circumstances, and ensuring proper billing for federal employees. Errors in these boxes can lead to frustrating denials, delayed payments, and increased administrative burden. This guide, crafted by an RCM expert, will demystify these critical sections, providing you with the authoritative knowledge and practical strategies needed to master complex billing scenarios and prevent common pitfalls. Understanding the nuances of Medicare Secondary Payer (MSP) rules, the appropriate application of Condition Codes, and the specific requirements for Federal Employees’ Compensation Act (FECA) claims is not just about compliance; it’s about maximizing your practice’s revenue cycle efficiency. We’ll dive deep into each box, offering step-by-step instructions, real-world examples, and expert advice to transform your billing process from reactive to proactive.

Quick Reference Guide

Before we delve into the granular details, here’s a quick reference table outlining the core purpose and key considerations for Boxes 9c, 10, and 11 on the CMS-1500 form. This serves as an immediate snapshot for quick verification during claim preparation.
Box NumberField NamePurposeKey Codes/RulesCommon Errors
9cPayer NameIdentifies the primary payer when Medicare is secondary.
  • MSP Types: 12 (WC), 13 (Black Lung), 14 (ESRD), 15 (GHP)
  • Requires NPI of primary payer.
  • Missing NPI
  • Incorrect MSP type
  • No primary payer listed
10Patient’s Condition Related ToIndicates if the patient’s condition is related to employment, auto accident, or other accident.
  • A: Employment (Work Comp)
  • B: Auto Accident
  • C: Other Accident
  • Requires state abbreviation for B/C.
  • Condition Codes (e.g., 20, 21, 22, 23, 24, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, A0, A1, A2, A3, A4, A5, A6, A7, A8, A9, B0, B1, B2, B3, B4, B5, B6, B7, B8, B9, C0, C1, C2, C3, C4, C5, C6, C7, C8, C9, D0, D1, D2, D3, D4, D5, D6, D7, D8, D9, E0, E1, E2, E3, E4, E5, E6, E7, E8, E9, F0, F1, F2, F3, F4, F5, F6, F7, F8, F9, G0, G1, G2, G3, G4, G5, G6, G7, G8, G9, H0, H1, H2, H3, H4, H5, H6, H7, H8, H9, I0, I1, I2, I3, I4, I5, I6, I7, I8, I9, J0, J1, J2, J3, J4, J5, J6, J7, J8, J9, K0, K1, K2, K3, K4, K5, K6, K7, K8, K9, L0, L1, L2, L3, L4, L5, L6, L7, L8, L9, M0, M1, M2, M3, M4, M5, M6, M7, M8, M9, N0, N1, N2, N3, N4, N5, N6, N7, N8, N9, O0, O1, O2, O3, O4, O5, O6, O7, O8, O9, P0, P1, P2, P3, P4, P5, P6, P7, P8, P9, Q0, Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, R0, R1, R2, R3, R4, R5, R6, R7, R8, R9, S0, S1, S2, S3, S4, S5, S6, S7, S8, S9, T0, T1, T2, T3, T4, T5, T6, T7, T8, T9, U0, U1, U2, U3, U4, U5, U6, U7, U8, U9, V0, V1, V2, V3, V4, V5, V6, V7, V8, V9, W0, W1, W2, W3, W4, W5, W6, W7, W8, W9, X0, X1, X2, X3, X4, X5, X6, X7, X8, X9, Y0, Y1, Y2, Y3, Y4, Y5, Y6, Y7, Y8, Y9, Z0, Z1, Z2, Z3, Z4, Z5, Z6, Z7, Z8, Z9, AA, AB, AC, AD, AE, AF, AG, AH, AI, AJ, AK, AL, AM, AN, AO, AP, AQ, AR, AS, AT, AU, AV, AW, AX, AY, AZ, BA, BB, BC, BD, BE, BF, BG, BH, BI, BJ, BK, BL, BM, BN, BO, BP, BQ, BR, BS, BT, BU, BV, BW, BX, BY, BZ, CA, CB, CC, CD, CE, CF, CG, CH, CI, CJ, CK, CL, CM, CN, CO, CP, CQ, CR, CS, CT, CU, CV, CW, CX, CY, CZ, DA, DB, DC, DD, DE, DF, DG, DH, DI, DJ, DK, DL, DM, DN, DO, DP, DQ, DR, DS, DT, DU, DV, DW, DX, DY, DZ, EA, EB, EC, ED, EE, EF, EG, EH, EI, EJ, EK, EL, EM, EN, EO, EP, EQ, ER, ES, ET, EU, EV, EW, EX, EY, EZ, FA, FB, FC, FD, FE, FF, FG, FH, FI, FJ, FK, FL, FM, FN, FO, FP, FQ, FR, FS, FT, FU, FV, FW, FX, FY, FZ, GA, GB, GC, GD, GE, GF, GG, GH, GI, GJ, GK, GL, GM, GN, GO, GP, GQ, GR, GS, GT, GU, GV, GW, GX, GY, GZ, HA, HB, HC, HD, HE, HF, HG, HH, HI, HJ, HK, HL, HM, HN, HO, HP, HQ, HR, HS, HT, HU, HV, HW, HX, HY, HZ, IA, IB, IC, ID, IE, IF, IG, IH, II, IJ, IK, IL, IM, IN, IO, IP, IQ, IR, IS, IT, IU, IV, IW, IX, IY, IZ, JA, JB, JC, JD, JE, JF, JG, JH, JI, JJ, JK, JL, JM, JN, JO, JP, JQ, JR, JS, JT, JU, JV, JW, JX, JY, JZ, KA, KB, KC, KD, KE, KF, KG, KH, KI, KJ, KK, KL, KM, KN, KO, KP, KQ, KR, KS, KT, KU, KV, KW, KX, KY, KZ, LA, LB, LC, LD, LE, LF, LG, LH, LI, LJ, LK, LL, LM, LN, LO, LP, LQ, LR, LS, LT, LU, LV, LW, LX, LY, LZ, MA, MB, MC, MD, ME, MF, MG, MH, MI, MJ, MK, ML, MM, MN, MO, MP, MQ, MR, MS, MT, MU, MV, MW, MX, MY, MZ, NA, NB, NC, ND, NE, NF, NG, NH, NI, NJ, NK, NL, NM, NN, NO, NP, NQ, NR, NS, NT, NU, NV, NW, NX, NY, NZ, OA, OB, OC, OD, OE, OF, OG, OH, OI, OJ, OK, OL, OM, ON, OO, OP, OQ, OR, OS, OT, OU, OV, OW, OX, OY, OZ, PA, PB, PC, PD, PE, PF, PG, PH, PI, PJ, PK, PL, PM, PN, PO, PP, PQ, PR, PS, PT, PU, PV, PW, PX, PY, PZ, QA, QB, QC, QD, QE, QF, QG, QH, QI, QJ, QK, QL, QM, QN, QO, QP, QQ, QR, QS, QT, QU, QV, QW, QX, QY, QZ, RA, RB, RC, RD, RE, RF, RG, RH, RI, RJ, RK, RL, RM, RN, RO, RP, RQ, RR, RS, RT, RU, RV, RW, RX, RY, RZ, SA, SB, SC, SD, SE, SF, SG, SH, SI, SJ, SK, SL, SM, SN, SO, SP, SQ, SR, SS, ST, SU, SV, SW, SX, SY, SZ, TA, TB, TC, TD, TE, TF, TG, TH, TI, TJ, TK, TL, TM, TN, TO, TP, TQ, TR, TS, TT, TU, TV, TW, TX, TY, TZ, UA, UB, UC, UD, UE, UF, UG, UH, UI, UJ, UK, UL, UM, UN, UO, UP, UQ, UR, US, UT, UU, UV, UW, UX, UY, UZ, VA, VB, VC, VD, VE, VF, VG, VH, VI, VJ, VK, VL, VM, VN, VO, VP, VQ, VR, VS, VT, VU, VV, VW, VX, VY, VZ, WA, WB, WC, WD, WE, WF, WG, WH, WI, WJ, WK, WL, WM, WN, WO, WP, WQ, WR, WS, WT, WU, WV, WW, WX, WY, WZ, XA, XB, XC, XD, XE, XF, XG, XH, XI, XJ, XK, XL, XM, XN, XO, XP, XQ, XR, XS, XT, XU, XV, XW, XX, XY, XZ, YA, YB, YC, YD, YE, YF, YG, YH, YI, YJ, YK, YL, YM, YN, YO, YP, YQ, YR, YS, YT, YU, YV, YW, YX, YY, YZ, ZA, ZB, ZC, ZD, ZE, ZF, ZG, ZH, ZI, ZJ, ZK, ZL, ZM, ZN, ZO, ZP, ZQ, ZR, ZS, ZT, ZU, ZV, ZW, ZX, ZY, ZZ)
  • Incorrect box checked
  • Missing state for accidents
  • Misapplication of Condition Codes
11Insured’s Policy Group or FECA NumberProvides policy/group number for the insured or the FECA number for federal employees.
  • FECA: 9-digit case number (e.g., A12-345-678)
  • Requires date of injury for FECA.
  • Incorrect FECA format
  • Missing date of injury
  • Confusing FECA with regular WC

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Detailed Breakdown: Mastering CMS-1500 Boxes 9c, 10, and 11

To truly master the CMS-1500 form, particularly for complex scenarios, a deep understanding of each field’s purpose and specific requirements is essential. This section will provide an in-depth look at Boxes 9c, 10, and 11, incorporating best practices and addressing common challenges. For more general guidance on the CMS-1500 form, refer to our comprehensive guide on [CMS-1500 Form Basics](https://www.cms1500claimbilling.com/cms-1500-form-basics/).

Box 9c: Payer Name (Medicare Secondary Payer – MSP)

Box 9c is specifically designed to identify the primary payer when Medicare is the secondary payer. This is a critical component of Medicare Secondary Payer (MSP) rules, which dictate that in certain situations, another insurer has primary responsibility for paying a patient’s medical claims before Medicare. Failing to correctly identify the primary payer in Box 9c will inevitably lead to Medicare denials.

Understanding Medicare Secondary Payer (MSP) Scenarios

The Centers for Medicare & Medicaid Services (CMS) outlines several scenarios where Medicare may be secondary. It’s crucial to identify the correct MSP type to ensure accurate billing.
  • Working Aged (Type 15 – GHP): For beneficiaries aged 65 or older who are covered by a Group Health Plan (GHP) through their own or their spouse’s current employment. The GHP is primary if the employer has 20 or more employees.
  • Step-by-Step:
  • 1. Verify the patient’s age and GHP coverage. 2. Confirm the employer size (20+ employees). 3. Enter the primary GHP’s name in Box 9a. 4. Enter the primary GHP’s policy/group number in Box 9b. 5. Enter the primary GHP’s NPI in Box 9c. 6.

    FAQ: Common Questions Answered

    What are the most common Condition Codes used in Box 10 and how do they impact claim processing?

    Condition Codes in Box 10 are critical flags that communicate special circumstances affecting a claim’s adjudication. While a comprehensive list is extensive, some frequently encountered codes include ’04’ (Patient is a student), ’20’ (Beneficiary requested payment), ’21’ (Billing for denial purposes for a non-covered service), ’22’ (Payment for a non-covered service for denial purposes), ’23’ (Impact of a disaster or emergency), and ‘G0’ (Services related to an accident). These codes directly impact claim processing by signaling to the payer that specific rules, waivers, or documentation requirements may apply. For instance, ‘G0’ indicates an accident, prompting the payer to look for accident-related information and potentially triggering coordination of benefits with an auto or liability insurer. Incorrect or missing Condition Codes can lead to immediate denials, as the payer’s automated systems may not understand the context of the services rendered, resulting in a frustrating cycle of appeals and resubmissions for the billing team.

    How can healthcare providers efficiently verify a patient’s Medicare Secondary Payer (MSP) status for Box 9c?

    Efficiently verifying a patient’s Medicare Secondary Payer (MSP) status is paramount to avoid claim denials and ensure correct billing order. The most reliable methods involve a multi-pronged approach. Firstly, a comprehensive patient intake questionnaire should explicitly ask about other insurance coverage, employment status, and accident details. Secondly, leveraging electronic eligibility verification systems (e.g., through your practice management software or a clearinghouse) can often provide real-time MSP information directly from Medicare’s Beneficiary and Eligibility Data System (BETS). Thirdly, for more complex or unclear scenarios, direct contact with Medicare via their Interactive Voice Response (IVR) system or the Beneficiary Contact Center can yield definitive MSP details. It’s crucial to remember that relying solely on the patient’s memory or their Medicare card is insufficient, as MSP status can change and isn’t always indicated on the card. Proactive and thorough verification at the point of service is your strongest defense against MSP-related denials.

    What are the specific requirements for obtaining and using a FECA Number in Box 11 for federal employees?

    The Federal Employees’ Compensation Act (FECA) Number, also known as the Office of Workers’ Compensation Programs (OWCP) claim number, is a unique 7-digit identifier assigned by the Department of Labor for work-related injuries or illnesses sustained by federal employees. It is absolutely critical for billing services under FECA. The primary requirement is that this number must be obtained directly from the patient or their federal employer/agency. Providers cannot typically look up or generate this number themselves. It is imperative that the number is accurate and corresponds to the specific injury or illness being treated. Unlike a standard patient ID or Social Security Number, the FECA number is tied to the accepted claim for a specific incident. Its absence or inaccuracy in Box 11 will result in an immediate denial of the claim, as it’s the key identifier that allows OWCP to link the services to an approved compensation case. Diligent collection of this number at the time of service is non-negotiable for successful FECA billing.

    Why are Boxes 9c, 10, and 11 so frequently a source of claim denials, and what’s the overarching strategy to mitigate this?

    Boxes 9c, 10, and 11 are frequent culprits for claim denials because they deal with exceptions and special circumstances rather than standard primary payer scenarios. Box 9c addresses Medicare Secondary Payer rules, which are inherently complex due to various MSP types and coordination of benefits. Box 10 utilizes Condition Codes, which are nuanced flags that, if misapplied or omitted, can cause a claim to be processed incorrectly or rejected outright. Box 11, specifically for FECA claims, requires a unique federal claim number that is often overlooked or difficult to obtain. The overarching strategy to mitigate these denials is a proactive, multi-faceted approach centered on education, robust intake processes, and diligent verification. This means continuous training for billing staff on MSP rules, Condition Code applications, and FECA requirements; implementing comprehensive patient intake forms that capture all necessary information; utilizing electronic eligibility tools for real-time MSP verification; and establishing clear protocols for obtaining FECA numbers. Essentially, it’s about transforming reactive denial management into proactive prevention by ensuring data accuracy and contextual understanding at the earliest possible stage of the revenue cycle.

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