Rendering Provider vs Billing Provider: Who Goes in Which Box on the Claim

The rendering provider is the individual who personally performed or directly supervised a service on a claim line. The billing provider is the person or organization that submits the claim and receives the payment. In a group they are two different NPIs; for a solo physician they are the same person in two boxes.

Most provider-identifier denials happen because one of these roles is in the wrong box. Once you understand the roles, it is clear which box each one goes in.

Where you see it

Role	CMS-1500 (02/12)	837P loop	What goes there
Rendering provider	24J unshaded (one per line)	2310B at claim level, 2420A when a line differs	Type 1 NPI of the person who performed or supervised the service
Billing provider	33, 33a, 33b	2010AA	Name, address, phone and NPI of the entity being paid; 33b only for a payer-assigned ID or taxonomy when the payer asks
Pay-to address	none (the box 33 address is used)	2010AB	A different payment address, sent only when it differs from 2010AA
Referring provider	17 with qualifier DN, 17b	2310A	Name and NPI of the physician who referred the patient
Ordering provider	17 with qualifier DK, 17b	2420E (line level)	Name and NPI of the physician who ordered a test, drug or supply
Supervising provider	17 with qualifier DQ, 17b	2310D	Required by some Medicare policies, for example incident-to services
Service facility	32, 32a	2310C	Where the service happened, when it was not the billing provider’s address
Signature	31	none	The provider’s signature or “Signature on File”; for incident-to services, the supervising physician signs

Medicare’s instructions for these items are in chapter 26 of the Claims Processing Manual; the NUCC manual covers the form for all payers. Medicare wants one referring, ordering or supervising physician per claim, so a claim that involves two of them is split in two. On the remittance, Noridian’s field descriptions call the 24J provider the PERF PROV (performing provider) and take it from box 33 for a sole provider.

The rendering, referring, ordering and supervising roles are always a person, so always a Type 1 NPI. The billing role is whoever holds the tax ID being paid: a Type 2 for a group, a Type 1 for a solo practice.

Group versus solo

A solo physician who bills under their own name and Social Security number or EIN is the rendering and billing provider at once. Their Type 1 NPI appears in 24J and in 33a, and the tax ID in box 25 is theirs.

A group practice bills under a group name, tax ID and Type 2 NPI in box 33a, and box 24J carries the Type 1 of whichever physician saw the patient on that line, which is why a six-line claim can show two rendering NPIs. For Medicare, each physician must also have reassigned benefits to the group (reported on the CMS-855I now that the CMS-855R has been discontinued); without it, a correct Type 1 in 24J still denies because the MAC has no link between that physician and the group being paid. The mistake in the other direction is the group’s Type 2 in 24J. Box 24J must show a person’s Type 1 NPI.

Worked example

Sample Radiation Oncology, PC is a three-physician group with its own freestanding center. Dr. Patel treats a prostate patient referred by Dr. Kim, a urologist in an unrelated practice. Dr. Lee, a partner, supervised the IMRT delivery (77407) on a day Dr. Patel was at a tumor board.

Box	Entry	Why
17	DN Kim	referring physician and qualifier
17b	Dr. Kim’s Type 1 NPI
24J line 1 (77427)	Dr. Patel’s Type 1 NPI	she performed the weekly management visit
24J line 2 (77407)	Dr. Lee’s Type 1 NPI	he supervised the delivery; the NUCC defines the rendering provider as the person who rendered or supervised the care
25	the group’s EIN
31	Signature on File
32, 32a	blank	the service happened at the billing provider’s own address
33, 33a	Sample Radiation Oncology, PC and its Type 2 NPI	the group is paid

Illustrative figures for line 1: billed 240.00, allowed 180.00, CO-45 60.00, PR-2 36.00, paid 144.00. The payment goes to the group’s account under its tax ID; the rendering NPI on the line is what the payer used to confirm Dr. Patel is enrolled, credentialed and in network.

If the same group treats at the hospital under contract, 24J and 33a do not change. Box 32a gains the hospital’s Type 2 NPI as the service facility and the place of service becomes POS 22.

Denials related to these boxes

Denial	What it usually means	Fix
CARC 16 with RARC N290	rendering provider identifier missing or invalid: blank 24J, a Type 2 NPI in 24J, or a typo	correct and resubmit
CARC 16 with RARC N257	billing provider identifier missing or invalid in 33a	correct and resubmit
CARC 16 with RARC N285 or N286	referring provider name or NPI missing or invalid in 17 or 17b	correct and resubmit
CARC 206 or 208	NPI missing, or NPI not matched to the payer’s enrollment record	check NPPES and the payer’s provider file
CARC 185	the rendering provider is not eligible to perform the service billed, often not enrolled or not reassigned to the group	enrollment work, then resubmit
CARC 183	the referring provider is not eligible to refer, often not enrolled in PECOS	obtain a valid referring provider, or appeal with documentation
CARC B7	the provider was not certified or eligible to be paid on that date of service	compare the date of service with the enrollment effective date

Every one of these is a correction and resubmission rather than an appeal, unless you believe the payer’s enrollment record is wrong.

What to do

• Build the provider list once. For each physician: Type 1 NPI, the groups they have reassigned to, the payers they are credentialed with. For each practice: Type 2 NPI, tax ID, pay-to address. Most 24J and 33a errors are setup errors, not keying errors.
• Check the referring provider before the first claim. A referring physician who is not enrolled in PECOS causes a Medicare denial even when the rest of the claim is correct.
• Read the remark code, not just the reason code. N290, N257 and N286 each name the role; the CARC alone (usually 16) does not. See group and reason codes.
• In Iridium Suite each provider record holds the Type 1 and each practice the Type 2, and the claim scrubber checks the rendering and billing identifiers on every claim before it is sent.

Related terms

• NPI numbers: Type 1 vs Type 2
• PTAN and Medicare enrollment
• Taxonomy codes
• CMS-1500 box by box
• Modifier Q6 and locum tenens billing
• Place of service codes

Further reading: NUCC 1500 Claim Form Reference Instruction Manual; Medicare Claims Processing Manual, chapter 26 (CMS-1500 data set); MLN006976 Medicare Billing: CMS-1500 and 837P; X12 Remittance Advice Remark Codes.