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Understanding the 90935 CPT Code & 97035 - Real Billing Insights

A professiona nurse catch clip board in hand write about the 90935 cpt code in lab for billing process.

The 90935 CPT code represents a hemodialysis procedure performed on a single day without a physician’s evaluation. It’s a crucial code for nephrology billing, often used in outpatient settings. Based on real-world billing experience, many clinics face denials due to documentation gaps, incorrect modifiers, or payer-specific policies.

Pairing this with the 97035 CPT codes used for ultrasound therapy brings unique physical or chiropractic billing challenges. This article shares first-hand insights, definitions, reimbursement details, and answers common queries to help practices avoid costly mistakes.

What Is CPT Code 90935?

CPT code 90935 is defined as:

Hemodialysis procedure with single physician or qualified healthcare professional evaluation, per day.

When to use 90935:

  • Outpatient dialysis services
  • Performed with evaluation
  • Single session per day

From a compliance standpoint, clinical documentation must support the dialysis session and the physician’s involvement for that date.

CPT Code 97035 - Description & Definition

The 97035 CPT code is used for ultrasound therapy, typically applied in physical therapy or chiropractic offices.

Definition of 97035 CPT Code:

Use of ultrasound modality on one or more targeted areas, billed per 15-minute interval.

This is a timed code, meaning documentation must show actual treatment duration in 15-minute units. Therapists must be actively engaged throughout the session to justify billing.

Reimbursement for CPT 97035

Reimbursement varies based on payer policies, geographical location, and whether it’s part of a therapy plan. On average:

  • Medicare pays around $8–$10 per unit of CPT code 97035.
  • Private insurers may reimburse $15–$25, depending on contracts.

To maximize payments, clinics should submit accurate units and link the service to ICD-10 codes like M54.5 (low back pain) or M25.561 (pain in right knee), as medically necessary.

Does CPT Code 97035 Need a Modifier?

Yes, depending on the situation:

  • GP modifier is mandatory for medical services under a therapy plan of care.
  • Modifier 59 may be necessary if billed with other timed services to show separate procedures.
  • Use modifier -XS when separating the procedure from other non-therapy services.

Pro tip: Always refer to your MAC (Medicare Administrative Contractor) for regional modifier rules.

Timed Billing Rules for 97035

Since 97035 is a time-based code, follow these rules:

Time Spent (Min)

Units Billed

8–22 mins

1 unit

23–37 mins

2 units

Document start and stop times in progress notes. Failing to fix so can generate audits or denials.

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CPT 97035 in Chiropractic Care

In chiropractic practices, ultrasound therapy (97035) helps reduce inflammation, improve soft tissue healing, and support mobility. Chiropractors must:

  • Show medical necessity
  • Must be part of a comprehensive, physician-supervised rehabilitation plan.
  • Avoid using 97035 as a standalone service unless justified

Real experience tip: Chiropractic claims are often denied when the GP modifier or documentation of direct patient contact is missing.

90935 CPT Code - Documentation Best Practices

To avoid denials:

  • Include physician evaluation notes for the dialysis date
  • Specify single-day treatment
  • Note some existing conditions that justify the procedure

Common ICD-10 codes:

  • N18.6 (End-stage renal disease)
  • Z99.2 (Dependence on renal dialysis)

Conclusion

Using 90935 CPT codes and 97035 CPT codes correctly is critical for timely reimbursements. From understanding modifiers to following timed code documentation rules, every step counts.

Don’t leave money on the table. Review your claims for accuracy, compliance, and efficiency.

Need Help With CPT Code Billing?

Partner with Cures Medical Billing Services for reliable, accurate claims handling. From CPT 90935 to ultrasound therapy billing (97035), we make sure maximum approvals and fewer denials.

Call us at +1 (917) 994-9941

 Or visit our website for tailored billing solutions.

Frequently Asked Questions (FAQs)

Rarely. They’re used in different specialties (nephrology vs. physical therapy) and aren’t typically billed on the same claim.

It indicates that the service is part of an approved therapy plan.

Yes, when medically necessary and properly documented with a GP modifier.

Missing physician notes, incorrect dates, or failing to meet the single-day rule.

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