Blog Archives - One O Seven RCM

MA04 Remark Code: What It Means and How to Fix It (2026 Update)

MA04 remark code 2026 hero banner: the same remark code pairing with CARC 22 on DME claims but CARC 16 on Part A and Part B claims depending on claim type, the correction that MA04 flags missing or illegible primary payer identity and payment data rather than an invalid MSP code, its administrative rather than appealable status since no coverage decision exists yet to dispute, the MA04 versus MA83 payer-order disambiguation, and the Loop 2320 and CMS-1500 Item 11 through 11D fields needed to rebuild the secondary claim, from One O Seven RCM.

What Does MA04 Mean MA04 remark code means a secondary payer cannot process your claim because it never received usable identity or payment information from the primary payer. Its name, paid amount, or adjustment details show up missing, blank, or illegible on the claim itself. The MA04 remark code flags a data problem, not a […]

N115 Remark Code: Meaning, Every CARC Pairing, and Fixes

N115 remark code 2026 hero banner: the Local Coverage Determination citation that always rides alongside a CARC rather than carrying the denial reason itself, the confidence-labeled CARC 50, 96, 150/151, and 167 pairing table, non-Medicare commercial and Medicaid payers that adopt a MAC's LCD and still cite N115 on claims that were never Medicare claims, the corrected-claim-versus-appeal decision test, and the N115 versus CARC 115, M115, and N386 disambiguation, from One O Seven RCM.

N115 is a remittance advice remark code. It means the payer based the decision on a Local Coverage Determination, a coverage policy set by a Medicare Administrative Contractor for its own jurisdiction. The N115 remark code usually rides next to CARC 50 or CARC 96 on the remittance. Fixing it starts with finding that LCD, […]

POS 51 in Medical Billing: The Inpatient Psychiatric Code That Decides Your Facility Rate and the 190-Day Clock

POS 51 in medical billing 2026 hero banner: inpatient psychiatric facility billing on the CMS-1500 and 837P, the Medicare 190-day lifetime limit applying to freestanding psychiatric hospitals but not distinct-part units inside general hospitals, the registration-status rule that sets the POS regardless of where the encounter physically happens, POS 51 versus POS 21's built-in "other than psychiatric" exclusion, and FY 2027 IPF PPS per diem rates effective October 1, 2026, from One O Seven RCM.

POS 51 in medical billing is the Place of Service code for an Inpatient Psychiatric Facility. You report it in Box 24B of the CMS-1500 professional claim, and it pays at the Medicare facility rate. Attribute Detail Code and name POS 51, Inpatient Psychiatric Facility CMS definition A facility that provides inpatient psychiatric services for […]

POS 72 in medical billing: the rural health clinic code and the claims it doesn’t belong on

POS 72 in medical billing 2026 hero banner: the Rural Health Clinic code that has no place on the UB-04 form Medicare RHC claims actually use, the CMS-1500 versus institutional TOB 71X routing split, POS 71 versus POS 72 hinging on health-department versus CMS certification, the non-facility payment designation, and the 2026 $165 per-visit all-inclusive rate cap, from One O Seven RCM.

POS 72 is the place of service code for a Rural Health Clinic. You report place of service 72 on a professional claim when care happened inside a CMS-certified RHC and the payer wants the setting identified in the place of service field. The code goes on one entry per service line. That definition covers […]

POS 50 in Medical Billing: The Federally Qualified Health Center Place of Service Code

POS 50 in medical billing 2026 hero banner: the Federally Qualified Health Center place of service code and its non-facility designation, the disconnect between POS 50 on the professional claim and the institutional G0466-G0470 and revenue code payment that actually prices the FQHC PPS encounter, when an FQHC does and doesn't report POS 50 across telehealth, SNF, and home settings, the POS 50 versus POS 71 designation test for county health departments, and the CY 2026 $207.72 base rate with its enhanced new-patient and preventive-visit adjustment, from One O Seven RCM.

POS 50 is the place of service code for a Federally Qualified Health Center, a facility in a medically underserved area that provides preventive primary medical care under the general direction of a physician. Most FQHC billing teams assume POS 50 drives their prospective payment system rate. It doesn’t. Medicare prices the encounter off the […]

CO-15 Denial Code: Why It’s Deactivated and How to Fix Auth Number Denials in 2026

CO-15 denial code 2026 hero banner: CARC 15 deactivated by X12 on May 1, 2018 but still appearing on payer remittances, the three collapsed failure modes now split into active codes 197, 284, and 296, the CO group code placing the adjustment on the provider instead of the patient, the corrected-claim-over-appeal routing test, and the Loop 2300 REF01 G1 authorization field placement rule on the 837 claim, from One O Seven RCM.

Key Takeaways Quick answer. The co 15 denial code combines group code CO with Claim Adjustment Reason Code 15, which X12 defines as an authorization number that is missing, invalid, or inapplicable to the billed services or provider. X12 stopped the code on May 1, 2018, so a claim carrying it in 2026 needs a […]

POS 23 in Medical Billing: The 2026 Emergency Room Place of Service Guide for Providers

POS 23 in medical billing 2026 hero banner: Emergency Room-Hospital as a facility-rate code decided by registration status rather than physical location, the admission-order split where an ED physician and hospitalist bill different correct codes for the same patient, CPT 99281-99285 locked bidirectionally to POS 23, the unprocessable-versus-denied claims distinction and its timely filing risk, and the 2026 dual conversion factor rates, from One O Seven RCM.

POS 23 in medical billing stands for Emergency Room-Hospital, the code the Centers for Medicare and Medicaid Services, or CMS, assigns to hospital emergency room claims. Physicians and non-physician practitioners report place of service 23 on the professional claim, in Item 24B, and it sets the facility payment rate for that line. This guide covers […]

POS 49 in Medical Billing: The Independent Clinic Place of Service Code

POS 49 in medical billing 2026 hero banner: Independent Clinic as a residual code selected only after every other place of service is ruled out, the non-facility payment rate, POS 11 versus POS 49 with no ownership test in either definition, the hospital-outpatient registration override, and the silent underpayment or overpayment risk when the code is wrong but the claim still pays, from One O Seven RCM.

POS 49 is the place of service code for an Independent Clinic. You report it when care happened in a freestanding outpatient clinic that isn’t part of a hospital and isn’t described by any other place of service code. That last clause does the work. You land on POS 49 after ruling out every more […]

PR-31 Denial Code: What “Patient Cannot Be Identified as Our Insured” Means and How to Fix It (CO-31 Included)

PR-31 denial code 2026 hero banner: patient cannot be identified as our insured under CARC 31, PR patient responsibility versus CO provider liability, N382 and MA130 remark code pairings, the 277CA rejection versus 835 denial distinction, and the CO-16 Medicare MBI trap, from One O Seven RCM.

The PR 31 denial code means the payer looked for your patient and couldn’t find a matching insured record. X12 words reason code 31 as “Patient cannot be identified as our insured.” The same code shows up as CO-31, and those two letters decide who owes the balance. Code 31 says nothing about medical necessity, […]

CO-170 Denial Code: Provider Type Denials, Group Code Liability, and the Fix Workflow

CO-170 denial code 2026 hero banner: payment denied by provider type under CARC 170, CO group code provider liability versus PR-170 patient liability for chiropractic exclusions, N95 and N115 remark code pairings, the seven-code provider eligibility family from 170 to B7, and the correction versus appeal decision path, from One O Seven RCM.

Your claim went out clean. The documentation supports the service, the coding is right, and the patient was eligible on the date of service. The remit comes back denied anyway. With a CO-170 denial code, the payer has looked past the service and landed on the provider who performed or billed it. Quick Answer The […]

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