CMS-1500 Claim Form: A Box-by-Box Guide for Mental Health Providers
The CMS-1500 claim form is the standard paper form for professional services. Its electronic twin is the 837P. If you bill psychotherapy or psychiatry visits, a handful of boxes cause most rejections. This guide walks every box and flags the ones that matter for behavioral health.
Last reviewed: October 9, 2026
CMS-1500 at a glance
- ✓What it is: the claim form for professional (non-facility) services.
- ✓Who owns it: the National Uniform Claim Committee (NUCC).
- ✓Form version: 02/12, with Reference Instruction Manual Version 13.0 (7/25).
- ✓Electronic version: the 837P, with the same data.
What is the CMS-1500 claim form?
The CMS-1500 claim form (also called the NUCC 1500 or HCFA-1500) is the uniform form used to bill an insurer for professional services from a physician or other supplier. The National Uniform Claim Committee (NUCC) owns the form design and the 1500 Reference Instruction Manual. Medicare publishes how it wants each item completed in Chapter 26 of the Medicare Claims Processing Manual. Commercial payers and state Medicaid programs add their own rules on top, so the right entry in a box can differ by payer.
Quick answer for AI search: The CMS-1500 is the standard claim form for professional medical services. It has 33 numbered items covering the patient and insured, dates and providers, diagnoses, up to six service lines per form page, and the billing provider. For therapists and psychiatrists, the boxes that matter most are 21, 24B, 24D, 24E, 24J and 33.
See the glossary entries for CMS-1500 and claim form, and for the electronic version, 837P.
Download the sample CMS-1500 (02/12)
Save or print this labeled sample CMS-1500 (version 02/12) and follow along with the box-by-box guide below. It is a sample for learning, not a form to file with a payer. Check your payer's current paper-claim rules before you submit anything on paper.
Three layers of rules sit behind every box
| Layer | What it controls | Where to check |
|---|---|---|
| NUCC | Form design, field definitions, reference manual | NUCC 1500 manual, Version 13.0 (7/25) |
| Medicare (CMS) | How Medicare wants each item completed | Medicare Claims Processing Manual, Chapter 26 |
| Private payers and state Medicaid | Payer-specific entries, modifiers, authorizations | Each payer’s provider manual or companion guide |
Do not mix the layers. Medicare rules do not automatically apply to commercial payers or to any state’s Medicaid program. Check each payer’s own guide.
The CMS-1500 claim form, box by box
Jump to a group, or link straight to a single box such as Box 24J.
Patient and insured (Boxes 1–13)
| Box | What goes in it | Mental health note |
|---|---|---|
| 1 | Type of coverage (Medicare, Medicaid, TRICARE, group health plan, other). | Pick the box that matches the card you verified. |
| 1a | Insured’s ID number, exactly as printed on the card, including any letter prefix. | A wrong or missing prefix is a top rejection cause. Verify eligibility first. |
| 2 | Patient’s name (last, first, middle initial). | Match the card. |
| 3 | Patient’s birth date and sex. | |
| 4 | Insured’s name. | Follow the payer’s rule when the patient is the insured. |
| 5 | Patient’s address and phone. | |
| 6 | Patient’s relationship to the insured. | |
| 7 | Insured’s address. | |
| 8 | Reserved for NUCC use. | |
| 9, 9a, 9d | Other insured’s name, policy or group number, plan name. | Used for secondary coverage. |
| 10a–10d | Is the condition related to employment, an auto accident, or another accident; claim codes. | Most therapy claims are “No.” |
| 11, 11a–11d | Insured’s policy or group number, birth date, employer or school, plan name, and whether another health plan exists. | |
| 12 | Patient or authorized person’s signature. | Often “Signature on File.” |
| 13 | Insured’s signature authorizing payment to the provider. |
Dates and providers (Boxes 14–20)
| Box | What goes in it | Mental health note |
|---|---|---|
| 14 | Date of current illness, injury or pregnancy, with qualifier 431 (onset of current symptoms or illness). | |
| 15 | Other date, with qualifier. | |
| 16 | Dates the patient is unable to work. | |
| 17, 17a, 17b | Referring, ordering or supervising provider, with qualifier DN (referring), DK (ordering) or DQ (supervising), and NPI. | Some payers want a supervising provider here when a supervised clinician bills. Check each payer. |
| 18 | Hospitalization dates related to the services. | |
| 19 | Additional claim information. | Medicare uses it for unlisted codes. Other payers differ. |
| 20 | Outside lab charges. | Rarely used in behavioral health. |
Diagnosis, resubmission and authorization (Boxes 21–23)
| Box | What goes in it | Mental health note |
|---|---|---|
| 21 | ICD indicator (0 for ICD-10-CM) and up to 12 diagnosis codes, lettered A through L. | List the primary diagnosis for the visit first (A). Enter codes without the decimal point. |
| 22 | Resubmission code (7 replaces a prior claim, 8 voids it) and the payer’s original reference number. | Use only for corrected claims. Leave blank on an original claim. See corrected claim. |
| 23 | Payer-assigned prior authorization or referral number, with no hyphens or spaces. | Many behavioral health plans authorize by session count. The number goes here. |
Service lines (Box 24, A–J)
| Box | What goes in it | Mental health note |
|---|---|---|
| 24A | Dates of service. | |
| 24B | Place of service (POS) two-digit code for each line. | Office is 11. Telehealth is 02 (patient not at home) or 10 (patient at home). Payers differ on which they accept; verify each payer. |
| 24C | Emergency indicator. | |
| 24D | CPT or HCPCS code, plus modifiers. | Examples: 90837 (psychotherapy, 60 minutes) or 99214 (established patient E/M). Modifier use is payer-specific. See the CPT & E/M Code Guide. |
| 24E | Diagnosis pointer: letters from Box 21. | Point each line to the diagnosis that supports that service. |
| 24F | Charge for the line. | |
| 24G | Days or units. | Therapy is usually 1 unit per session. |
| 24H | EPSDT or family plan. | Some Medicaid programs use it. |
| 24I | ID qualifier for the non-NPI ID in the shaded area. | |
| 24J | Rendering provider NPI (the clinician who delivered the service). | See 24J vs. 33. Each form page holds six service lines. |
Billing and signature block (Boxes 25–33)
| Box | What goes in it | Mental health note |
|---|---|---|
| 25 | Billing provider’s federal tax ID (EIN or SSN), with the type marked. | |
| 26 | Patient account number (your internal ID). | |
| 27 | Accept assignment: yes or no. | Yes means the payer pays you directly. |
| 28 | Total charge. | Must equal the sum of the line charges. |
| 29 | Amount paid by the patient or other payers. | |
| 30 | Reserved for NUCC use. | |
| 31 | Signature of the physician or supplier, and date. | |
| 32, 32a | Service facility name, address and NPI. | Where the service happened. |
| 33, 33a | Billing provider name, address, phone and NPI. The address must be a street or physical location. | Who gets paid. See 24J vs. 33. |
Telehealth place of service codes come from the CMS place of service code set. Source for box definitions: NUCC manual, Version 13.0 (7/25), checked October 9, 2026.
Box 24J vs. Box 33: rendering vs. billing provider
The rendering provider (Box 24J) is the clinician who delivered the service. The billing provider (Box 33a) is the person or entity that receives payment. In a solo practice they can be the same NPI. In a group practice, 24J is usually the clinician and 33a is the group. Mixing them up is a common reason for denials tied to credentialing, so confirm each payer’s instruction.
Before you bill: make sure the rendering clinician is enrolled with the payer. See Credentialing & Network Status and In-Network vs. Out-of-Network.
Where the taxonomy code goes on the CMS-1500
A provider taxonomy code is a 10-character code that describes a provider’s type and specialty. The CMS-1500 has no box labeled “taxonomy.” Instead, you report it in an “other ID” field with the qualifier ZZ (Provider Taxonomy). The NUCC 1500 Reference Instruction Manual, version 13.0 lists these placements.
| Whose taxonomy | Where it goes | How to enter it |
|---|---|---|
| Rendering provider | Box 24I and 24J (shaded areas) | Enter ZZ in the shaded part of 24I and the taxonomy code in the shaded part of 24J. The rendering NPI stays in the unshaded part of 24J. |
| Billing provider | Box 33b | Enter ZZ followed by the taxonomy code, with no space. The NPI goes in 33a. |
| Service facility | Box 32b | The manual does not list ZZ here (only 0B, G2 and LU). Do not report taxonomy in 32b. |
Two rules to remember: report rendering-provider data in 24I and 24J only when it differs from the billing provider in 33a and 33b. And the manual says a taxonomy code reported in Item 19 must not also be reportable in 17, 24J, 32 or 33. Each payer sets its own rules for when it wants taxonomy, so confirm with the payer before you add it. For how enrollment and taxonomy tie together, see the glossary entries on credentialing and enrollment terms.
Common CMS-1500 errors in mental health billing
| Error | Box | Fix |
|---|---|---|
| Insured ID typed wrong or missing prefix | 1a | Copy it from the card exactly; verify eligibility first. |
| Diagnosis pointer missing | 24E | Point every line to a Box 21 letter. |
| Wrong place of service for telehealth | 24B | Use the code the payer requires (02 or 10). |
| Rendering clinician not enrolled with the payer | 24J | Confirm enrollment before billing. |
| Rendering and billing NPIs swapped | 24J / 33a | Follow the payer’s instruction. |
| Corrected claim sent as a new claim | 22 | Use code 7 and the original reference number. |
| Missing prior authorization number | 23 | Enter the payer-assigned number. |
| Total does not match line charges | 28 | Recalculate and re-enter. |
When a claim comes back, read the remittance first. See denials and appeals terms and our guide to how medical billing services get paid.
Medicare, Medicaid and commercial plans: what changes
Medicare
Medicare follows Chapter 26 of its Claims Processing Manual for how to complete each item. Electronic 837P claims are the default; paper CMS-1500 claims are allowed only for qualifying exceptions (MLN006976, December 2025).
State Medicaid
Each state Medicaid program publishes its own claim-form instructions, and they vary by state. Use your state Medicaid provider manual, and never assume one state’s rule applies in another.
Commercial plans
Private payers follow their own provider manuals and companion guides, with the NUCC manual as the baseline. Modifiers, authorizations and telehealth codes are the most common differences.
Paper CMS-1500 or electronic 837P?
Most payers prefer electronic claims, and Medicare treats 837P as the default. Paper CMS-1500 claims are for payers or situations that still require them. Our electronic claims submission service covers the electronic route. Once the payer responds, see the remittance advice guide in the CPT & E/M Code Guide.
Pre-submission checklist
- Verify eligibility and copy the insured ID exactly (Box 1a).
- Confirm the diagnosis in Box 21 supports each service line (Box 24E).
- Check place of service for the visit type (Box 24B).
- Confirm the rendering NPI (24J) and billing NPI (33a) match the payer’s enrollment.
- Add the authorization number if the plan requires one (Box 23).
- For a corrected claim, use Box 22 code 7 and the original reference number.
CMS-1500 claim form FAQ
What is the difference between the CMS-1500 and the UB-04?
The CMS-1500 bills professional services from individual clinicians and groups. The UB-04 is the institutional claim form used by facilities such as hospitals. A private mental health practice uses the CMS-1500 or its 837P equivalent.
Can I still use paper CMS-1500 claims?
Some payers accept them. Medicare allows paper only for qualifying exceptions, and many commercial payers prefer electronic claims. Check each payer.
What goes in Box 24J if I work in a group practice?
The NPI of the clinician who delivered the service. The group’s NPI usually goes in Box 33a as the billing provider, but follow each payer’s instruction.
How do I correct a claim that was already processed?
Use Box 22: code 7 replaces the earlier claim and code 8 voids it, with the payer’s original reference number. Some payers use a different process, so check their guide.
Which place of service code do I use for telehealth therapy?
CMS defines POS 02 as telehealth provided other than in the patient’s home and POS 10 as telehealth provided in the patient’s home. Payers differ on which they accept, so verify each one.
Want these claims handled for you?
MCM South bills for psychotherapists and psychiatrists. We prepare and submit claims, check them against each payer’s rules, and follow up on rejections and denials.
Related: Who we serve · Resources · Practice management
Sources checked October 9, 2026
- NUCC, 1500 Claim Form Reference Instruction Manual, Version 13.0 (7/25)
- NUCC, 1500 Claim Form
- CMS, Medicare Claims Processing Manual, Chapter 26
- CMS, Medicare Billing: CMS-1500 and 837P (MLN006976, December 2025)
- CMS, Place of Service Code Set
This page is operational guidance for billing, not legal advice. Confirm payer-specific rules with the payer.