Health First Colorado CPT Code Billing The Complete 2026 Guide for Providers

This Medicaid Colorado CPT Billing Guide covers Health First Colorado CPT Code Billing Colorado’s Medicaid program and billing it correctly comes down to five things: verify eligibility and RAE assignment before every visit, enroll properly with an active NPI, pick the right CPT code and modifier, check prior authorization requirements, and file your claim within 365 days of the date of service. Miss any one of these, and your claim denies often automatically, with no human ever reviewing it.

What Is Health First Colorado?

Health First Colorado is the official name for Colorado’s Medicaid program, administered by the Colorado Department of Health Care Policy & Financing (HCPF). It serves more than 1.8 million Coloradans, including children, pregnant members, adults, and people with disabilities who meet income and residency requirements.

CPT code billing for the program is governed by three layers of authority: HCPF’s service-specific billing manuals, the Colorado Code of Regulations (10 CCR 2505-10), and CMS guidance for the underlying CPT code set itself.

Health First Colorado vs. “Healthfirst” Don’t Confuse These Two

This trips up a surprising number of billers, and even some published billing guides mix the two up. Healthfirst (no space) is a commercial and Medicare Advantage health plan based in New York. Health First Colorado is Colorado’s state Medicaid program. They share no relationship, no shared payer ID, and no shared billing rules. If you’re searching for timely filing limits, fee schedules, or claim forms, make sure the source you’re reading is actually talking about the Colorado program some CPT billing content online references New York plan rules (like a 180-day filing window) while labeling it as Colorado guidance. That’s a different payer entirely, and following its rules for a Colorado claim will get you denied.

Fee-for-Service vs. Managed Care: What Determines Your Billing Path

Health First Colorado pays providers through two pathways, and knowing which one applies to your patient is the first step to billing correctly:

• Fee-for-Service (FFS): HCPF pays directly per the state fee schedule.
• Managed Care: A Regional Accountable Entity (RAE) manages payment for the member.

Most behavioral health services run through RAEs rather than FFS. Before submitting any claim, run a member eligibility query in the HCPF Provider Web Portal  it shows both Health First Colorado eligibility and which RAE, if any, is responsible for the member’s care. Billing the wrong payer is one of the most common causes of claim denial.

Your RAE Quick-Reference

Colorado’s RAE structure includes entities such as Colorado Access, Rocky Mountain Health Plans, Health Colorado Inc., Colorado Community Health Alliance, Northeast Health Partners, Denver Health, and Kaiser Permanente, each covering different regions and member populations. RAEs began actively enforcing stricter enrollment and NPI requirements on a rolling basis  Colorado Access started denying non-compliant claims on December 1, 2025, with most other RAEs following by January 5, 2026. Because RAE assignment and requirements can change, always confirm the current RAE and its specific billing rules through the Provider Web Portal eligibility query rather than assuming last year’s assignment still applies.

Provider Enrollment & the NPI Rule That Causes Automatic Denials

Before you can bill a single claim, you must be enrolled with Health First Colorado and maintain an active National Provider Identifier (NPI) in the HCPF system. Enrollment runs through the Colorado interChange (MMIS) Provider Web Portal.

The rule that trips up the most providers: all outpatient physical and occupational therapy providers must enter the NPI of the ordering provider on every claim. This applies to both CMS-1500 paper claims (field 17b) and electronic 837P submissions (loop 2420, using qualifier DK for ordering, DN for referring, or DQ for supervising). Miss this NPI, and the claim denies automatically  no manual review, no warning.

CPT & HCPCS Coding Basics

CPT (Current Procedural Terminology) codes are five-digit codes that describe every medical service a provider delivers. Health First Colorado uses the standard AMA CPT set alongside HCPCS Level II codes for supplies, equipment, and non-physician services not covered by CPT. A clean claim needs four elements to match up: the correct CPT/HCPCS code, the correct ICD-10 diagnosis code, accurate provider information, and the correct place-of-service code.

E/M Codes and a Change You Need to Know About

Evaluation and Management codes (99202–99215 for office and outpatient visits) are among the most frequently billed codes in Colorado Medicaid. HCPF follows CMS guidelines, letting providers base the visit level on either Medical Decision Making (MDM) or Total Time on the date of service.

Important: Colorado Medicaid no longer recognizes CPT consultation codes (99241–99245 for office/outpatient; 99251–99255 for inpatient), a change aligned with Medicare policy since 2010. Bill the appropriate E/M code that reflects where the visit occurred and how complex it was instead.

Adults may receive one covered physical exam per year but sports physicals are not a covered service under Health First Colorado.

Timed vs. Untimed Codes

Health First Colorado follows AMA guidelines distinguishing “timed” and “untimed” CPT codes. Timed codes common in physical and occupational therapy are billed in 15-minute increments, counting only time spent directly with the member. Documentation time, drive time, and administrative tasks don’t count. Untimed codes are billed as one unit per session regardless of how long the session ran.

Members are generally limited to 48 combined units of PT/OT services per rolling 12-month period before a Prior Authorization Request (PAR) is required evaluation and orthotic services don’t count toward that limit.

2025–2026 Fee Schedule & Rate Updates

The Health First Colorado Fee Schedule is the single authoritative source for CPT reimbursement rates, updated roughly twice a year and searchable by code at hcpf.colorado.gov/provider-rates-fee-schedule.

A 1.6% across-the-board (ATB) rate increase took effect July 1, 2025, following approval during the 2024 Colorado legislative session. It applies to most Fee-for-Service benefits, including physician services, dental care, and behavioral health.

Sample behavioral health rates (October 2025–June 2026):

CPT Code	Service Description	Medicaid Rate
90791	Psychiatric diagnostic evaluation	$159.67
90834	Psychotherapy, 45 minutes	$91.09
90837	Psychotherapy, 60 minutes	$134.51

These rates are subject to change  always confirm the current figure on the official fee schedule page rather than relying on any published table, including this one.

Behavioral Health CPT Code Billing

Behavioral health services for nearly all Health First Colorado members run through RAEs, not FFS. The State Behavioral Health Services (SBHS) Billing Manual is the authoritative source for mental health and substance use disorder billing.

Common behavioral health CPT codes:

CPT Code	Description	Billing Unit
90791	Psychiatric diagnostic evaluation	1 session
90832	Psychotherapy, 30 minutes	1 session
90834	Psychotherapy, 45 minutes	1 session
90837	Psychotherapy, 60 minutes	1 session
96130	Psychological testing evaluation, per hour	Timed
96127	Brief emotional/behavioral assessment	1 unit per instrument
H0049	Alcohol and/or drug screening	Per encounter

Modifiers You’ll Actually Use

Modifiers are two-digit (or two-character) codes appended to a CPT code to give Medicaid more context about how a service was performed. Using the wrong one  or skipping a required one  is a routine cause of denials.

Modifier	Meaning
25	Separate, significant E/M service on the same day as a procedure
59	Distinct procedural service
GT	Service delivered via telehealth
U1–U9	Colorado-specific modifiers used for certain state programs
HQ	Group setting service
33	Preventive service (bypasses member copay)

Telehealth Billing Rules

Modifier GT indicates a service was delivered via interactive audio and video telecommunications, and Health First Colorado requires it for eligible telehealth services. Place-of-service coding matters here too: telehealth psychotherapy, for example, typically pairs with POS 02, while audio-only visits generally aren’t reimbursable except in specific RAE-defined circumstances. Telehealth policy has expanded significantly in recent years, so verify the current requirements for your specific service type and the member’s RAE before billing.

Prior Authorization: What Needs It and What Doesn’t

Not every service requires prior authorization, but many specialty services, high-cost procedures, and some behavioral health services do  check before scheduling. Getting a PAR approved doesn’t guarantee payment and doesn’t waive timely filing: every claim, authorized or not, still has to meet standard eligibility and submission requirements. Prior authorization requirements are detailed in each service-specific billing manual and in 10 CCR 2505-10.

Claim Submission Forms and Key Fields

Health First Colorado accepts claims via the CMS-1500 paper form (professional services), the UB-04/CMS-1450 (institutional services), or as an 837P electronic transaction through the Provider Web Portal or a clearinghouse. Electronic submission is strongly preferred  it’s faster and generates fewer errors than paper.

Timely Filing: The Rule Almost Every Guide Gets Wrong

Here’s where a lot of published billing content  including some guides ranking for this exact keyword  goes sideways. Some sources cite a 180-day filing window, borrowing that figure from a different payer (the New York-based “Health First Health Plans,” not Health First Colorado). Others round to “12 months,” which is close but imprecise.

The actual rule, straight from HCPF’s own timely filing FAQ: providers always have at least 365 days from the date of service to submit a claim. If that window is about to close, submit the claim anyway even if it will be denied for another reason  because the 365-day submission itself is what matters.

There’s a second part almost nobody covers: after the initial 365-day period, providers must resubmit the claim every 60 days, referencing the previous Internal Control Number (ICN), to keep it within the timely filing continuity chain. Attaching a Remittance Advice isn’t an acceptable substitute for referencing the ICN. Waiting on a phone call or unanswered correspondence from HCPF or the fiscal agent is also not considered an acceptable reason for late filing the claim still has to go in.

Claims involving commercial insurance or other third-party liability must also be received within 365 days, with no additional extension.

Common Denial Reasons and How to Fix Them

The most frequent denial triggers, based on HCPF’s own bulletins and manuals, cluster around a handful of repeat offenders:

• Wrong or outdated CPT/HCPCS code
• Missing or incorrect modifier
• No prior authorization on file when one was required
• Billing the wrong payer (FFS vs. the correct RAE)
• Missing ordering/referring/prescribing (OPR) NPI on applicable claims
• Claim submitted outside the 365-day timely filing window
• Duplicate claims for the same service, same member, same day

Since July 1, 2025, National Correct Coding Initiative (NCCI) edits long used in Medicare  now also apply to Colorado Medicaid claims, flagging issues like billing an add-on code without its required primary code or exceeding allowable units per service. If your billing software hasn’t been updated to reflect NCCI logic, that’s a quiet source of new denials worth checking.

EPSDT & RPM/CGM Coverage for Members Under 21

Under federal Medicaid law (42 U.S.C. § 1396d(r)), Health First Colorado must provide Early and Periodic Screening, Diagnostic, and Treatment (EPSDT) benefits to all members under 21. Any medically necessary service that corrects or improves a physical, mental, or developmental condition identified through screening must be covered even if it isn’t explicitly listed in Colorado’s standard State Medicaid Plan. Autism Spectrum Disorder services for members under 21 fall under this expanded EPSDT mandate as of January 1, 2024.

Remote Patient Monitoring (RPM) using digital technology to continuously collect and transmit a patient’s clinical data is also a growing coverage area. Colorado’s SB 24-168 specifically mandates coverage for continuous glucose monitors (CGMs) and related supplies under both medical and pharmacy benefits. Some RPM services may require prior authorization; verify at the time of service.

Conclusion

Accurate CPT code billing is essential for timely reimbursement under Health First Colorado. By using the correct CPT, ICD-10-CM, and HCPCS codes, following Medicaid billing policies, and maintaining complete documentation, providers can reduce claim denials and improve revenue cycle efficiency. Staying informed about annual coding updates and payer-specific requirements will help ensure compliant billing and smoother claims processing throughout 2026. If your practice needs hands-on support with Colorado Medicaid claims, our medical billing services in Colorado team can help.

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